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<title>DP Chemistry: 4.3 Covalent structures (2) </title>
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science </a></li><li><a href="../19519/metals-and-icp-spectroscopy-1.html">Metals and ICP spectroscopy</a></li><li><a href="../19541/catalysts--1.html">Catalysts </a></li><li><a href="../19580/liquid-crystals-1.html">Liquid crystals</a></li><li><a href="../19665/polymers--1.html">Polymers </a></li><li><a href="../19672/nanotechnology-1.html">Nanotechnology</a></li><li><a href="../19843/environmental-impact-plastics-1.html">Environmental impact - plastics</a></li><li><a href="../19858/superconducting-metals-x-ray-crystallography--1.html">Superconducting metals & X-ray crystallography </a></li><li><a href="../19666/condensation-polymers-1.html">Condensation polymers</a></li><li><a href="../19916/environmental-impact-heavy-metals-1.html">Environmental impact - heavy metals</a></li></ul></li><li><a href="../19284/option-b--1.html" class="father">Option B </a><ul class="level-2"><li><a href="../19290/introduction-to-biochemistry--1.html">Introduction to biochemistry </a></li><li><a href="../19287/proteins-enzymes--1.html">Proteins & enzymes </a></li><li><a href="../19291/lipids-1.html">Lipids</a></li><li><a href="../19299/carbohydrates--1.html">Carbohydrates </a></li><li><a href="../19305/vitamins--1.html">Vitamins </a></li><li><a href="../19313/biochemistry-the-environment--1.html">Biochemistry & the environment </a></li><li><a href="../19336/proteins-enzymes-ahl--1.html">Proteins & enzymes (AHL) </a></li><li><a href="../19347/nucleic-acids--1.html">Nucleic acids </a></li><li><a href="../19361/biological-pigments--1.html">Biological pigments </a></li><li><a href="../19366/stereochemistry-in-biomolecules-1.html">Stereochemistry in biomolecules</a></li></ul></li><li><a href="../19390/option-c--1.html" class="father">Option C </a><ul class="level-2"><li><a href="../19391/energy-sources-1.html">Energy sources</a></li><li><a href="../19407/fossil-fuels-1.html">Fossil fuels</a></li><li><a href="../19411/nuclear-fusion-nuclear-fission-reactions-1.html">Nuclear fusion & nuclear fission reactions</a></li><li><a href="../19429/solar-energy-1.html">Solar energy</a></li><li><a href="../19437/environmental-impact-global-warming-1.html">Environmental impact - global warming</a></li><li><a href="../19453/electrochemistry-rechargeable-batteries-fuel-cells-1.html">Electrochemistry, rechargeable batteries & fuel cells</a></li><li><a href="../19458/nuclear-fusion-fission-hl--1.html">Nuclear fusion & fission (HL) </a></li><li><a href="../19470/photovoltaic-cells-and-dsscs-1.html">Photovoltaic cells and DSSCs</a></li></ul></li><li><a href="../19078/option-d-1.html" class="father">Option D</a><ul class="level-2"><li><a href="../19079/pharmaceutical-products-drug-action--1.html">Pharmaceutical products & drug action </a></li><li><a href="../19158/aspirin-penicillin--1.html">Aspirin & penicillin </a></li><li><a href="../19174/opiates-1.html">Opiates</a></li><li><a href="../19184/ph-regulation-of-the-stomach-1.html">pH regulation of the stomach</a></li><li><a href="../19194/antiviral-medications--1.html">Antiviral medications </a></li><li><a href="../19211/environmental-impact-of-some-medications-1.html">Environmental impact of some medications</a></li><li><a href="../19254/taxol-a-chiral-auxiliary-case-study-1.html">Taxol - a chiral auxiliary case study</a></li><li><a href="../19258/nuclear-medicine--1.html">Nuclear medicine </a></li><li><a href="../19273/drug-detection-analysis--1.html">Drug detection & analysis </a></li></ul></li></ul></li><li><a href="../16592/practical-scheme-of-work-ia--1.html">Practical scheme of work & IA </a><ul class="level-1"><li><a href="../16682/internal-assessment-1.html" class="father">Internal Assessment</a><ul class="level-2"><li><a href="../18892/scaffolding-the-investigation-1.html">'Scaffolding' the investigation</a></li><li><a href="../18896/timing-organisation--1.html">Timing & organisation </a></li><li><a href="../18905/choosing-the-research-question-1.html">Choosing the research question</a></li><li><a href="../18946/personal-engagement-1.html">Personal engagement</a></li><li><a href="../18950/exploration-1.html">Exploration</a></li><li><a href="../18957/analysis-1.html">Analysis</a></li><li><a href="../18965/evaluation-1.html">Evaluation</a></li><li><a href="../18966/communication-1.html">Communication</a></li><li><a href="../19882/internal-standardization-of-the-ia-1.html">Internal standardization of the IA</a></li><li><a href="../19901/submitting-the-samples-for-moderation-2.html">Submitting the samples for moderation</a></li><li><a href="../33754/ten-suggestions-for-ias-using-secondary-data-1.html">Ten suggestions for IAs using secondary data</a></li><li><a href="../37544/gaining-full-marks-for-a-databased-ia--1.html">Gaining full marks for a databased IA </a></li><li><a href="../19506/ia-example-marking-exercise--1.html">IA example & marking exercise </a></li><li><a href="../23929/genuine-examples-of-moderated-ia-reports-1.html">Genuine examples of moderated IA reports</a></li><li><a href="../25234/examples-of-teacher-marked-ia-reports--1.html">Examples of teacher-marked IA reports </a></li><li><a href="../37542/history-of-internal-assessment-1.html">History of Internal Assessment</a></li></ul></li><li><a href="../16598/mandatory-laboratory-components-1.html" class="father">Mandatory laboratory components</a><ul class="level-2"><li><a href="../16613/formula-of-magnesium-oxide--1.html">Formula of magnesium oxide </a></li><li><a href="../16612/determining-the-mr-of-an-unknown-gas-1.html">Determining the <i>M</i><sub>r</sub> of an unknown gas</a></li><li><a href="../16615/acid-base-titrations--1.html">Acid-base titrations </a></li><li><a href="../16616/a-green-acid-base-practical-1.html">A green acid-base practical</a></li><li><a href="../16617/analysis-of-aspirin-tablets-1.html">Analysis of aspirin tablets</a></li><li><a href="../16618/caco3-in-egg-shells-1.html">CaCO<sub>3</sub> in egg shells</a></li><li><a href="../16644/enthalpy-changes-1.html">Enthalpy changes</a></li><li><a href="../16631/reaction-rates-1.html">Reaction rates</a></li><li><a href="../16635/rate-dependent-factors-1.html">Rate-dependent factors</a></li><li><a href="../16636/determining-ea-for-a-reaction-1.html">Determining <i>E</i><sub>a</sub> for a reaction</a></li><li><a href="../16637/iodination-of-propanone-1.html">Iodination of propanone</a></li><li><a href="../18144/titrations-with-a-ph-meter-1.html">Titrations with a pH meter</a></li><li><a href="../18355/redox-titration-with-kmno4--1.html">Redox titration with KMnO<sub>4</sub> </a></li><li><a href="../16640/voltaic-cells-1.html">Voltaic cells</a></li><li><a href="../16659/3-d-molecular-modelling--1.html">3-D molecular modelling </a></li></ul></li><li><a href="../17168/other-good-practicals-1.html" class="father">Other good practicals</a><ul class="level-2"><li><a href="../17196/common-chemical-reactions-1.html">Common chemical reactions</a></li><li><a href="../227/elements-oxides-of-the-third-period--1.html">Elements & oxides of the third period </a></li><li><a href="../17239/the-halogens-1.html">The halogens</a></li><li><a href="../17162/boiling-points-of-mixtures-1.html">Boiling points of mixtures</a></li><li><a href="../17170/polarity-of-molecules-1.html">Polarity of molecules</a></li><li><a href="../18083/le-chateliers-principle--1.html">Le Chatelier's principle </a></li><li><a href="../19582/determining-kc-for-an-esterification-reaction-1.html">Determining <i>K</i><sub>c</sub> for an esterification reaction</a></li><li><a href="../18164/redox-reactions-of-vanadium--1.html">Redox reactions of vanadium </a></li><li><a href="../18351/chlorine-in-swimming-pools--1.html">Chlorine in swimming pools </a></li><li><a href="../18178/analysis-of-cuii-ions-in-solution--1.html">Analysis of Cu(II) ions in solution </a></li><li><a href="../18179/percentage-of-copper-in-brass-1.html">Percentage of copper in brass</a></li><li><a href="../18356/electrolytic-cells--1.html">Electrolytic cells </a></li><li><a href="../18598/reactions-of-organic-compounds-1.html">Reactions of organic compounds</a></li><li><a href="../18752/hydrolysis-of-halogenoalkanes-1.html">Hydrolysis of halogenoalkanes</a></li><li><a href="../18784/preparation-of-13-dinitrobenzene--1.html">Preparation of 1,3-dinitrobenzene </a></li><li><a href="../19022/determination-of-an-organic-structure-1.html">Determination of an organic structure</a></li><li><a href="../19887/preparation-of-nylon-66-1.html">Preparation of nylon 6,6</a></li><li><a href="../19343/determination-of-vitamin-c-content--1.html">Determination of vitamin C content </a></li><li><a href="../19342/hydrolysis-of-starch--1.html">Hydrolysis of starch </a></li><li><a href="../19159/preparation-purification-of-aspirin--1.html">Preparation & purification of aspirin </a></li></ul></li><li><a href="../18851/ict-in-practical-work-1.html" class="father">ICT in practical work</a><ul class="level-2"><li><a href="../18852/data-logging--1.html">Data logging </a></li><li><a href="../18853/software-for-graph-plotting--1.html">Software for graph plotting </a></li><li><a href="../18854/spreadsheets-for-data-processing--1.html">Spreadsheets for data processing </a></li><li><a href="../18855/databases-1.html">Databases</a></li><li><a href="../18856/computer-modelling-simulations--1.html">Computer modelling & simulations </a></li></ul></li><li><a href="../16594/group-4-project-1.html" class="father">Group 4 Project</a><ul class="level-2"><li><a href="../16595/practicalities-1.html">Practicalities</a></li><li><a href="../16596/reflective-statement--2.html">Reflective statement </a></li></ul></li><li><a href="../16666/a-new-laboratory-1.html">A new laboratory?</a></li></ul></li><li><a href="../16284/exams-1.html">Exams</a><ul class="level-1"><li><a href="../16286/essential-facts-1.html" class="father">Essential Facts</a><ul class="level-2"><li><a href="../16287/objectives-command-terms-1.html">Objectives & command terms</a></li><li><a href="../16288/grade-descriptors-1.html">Grade descriptors</a></li><li><a href="../16289/grade-boundaries-1.html">Grade boundaries</a></li></ul></li><li><a href="../16302/paper-1-multiple-choice-1.html" class="father">Paper 1 (Multiple Choice)</a><ul class="level-2"><li><a href="../16303/advice-to-students-paper-1-1.html">Advice to students (Paper 1)</a></li><li><a href="../31515/practice-paper-1-exams-1.html">Practice Paper 1 exams</a></li></ul></li><li><a href="../16305/paper-2-1.html" class="father">Paper 2</a><ul class="level-2"><li><a href="../16306/advice-to-students-paper-2-1.html">Advice to students (Paper 2)</a></li><li><a href="../16307/areas-of-difficulty-1.html">Areas of difficulty</a></li></ul></li><li><a href="../16313/paper-3--1.html" class="father">Paper 3 </a><ul class="level-2"><li><a href="../16314/advice-to-students-paper-3-1.html">Advice to students (Paper 3)</a></li><li><a href="../16342/data-response-questions-1.html">Data response questions</a></li><li><a href="../20054/experimental-work-questions-1.html">Experimental work questions</a></li></ul></li><li><a href="../16324/the-examination-process-1.html" class="father">The examination process</a><ul class="level-2"><li><a href="../16316/setting-the-exam-papers-1.html">Setting the exam papers</a></li><li><a href="../16317/predicted-grades-1.html">Predicted grades</a></li><li><a href="../16318/marking-the-papers-1.html">Marking the papers</a></li><li><a href="../16319/commenting-on-the-exams-1.html">Commenting on the exams</a></li><li><a href="../16320/grade-awarding-1.html">Grade Awarding</a></li><li><a href="../16321/enquiry-upon-results-1.html">Enquiry upon results</a></li><li><a href="../16322/chief-examiners-report-1.html">Chief Examiner's report</a></li><li><a href="../16323/retaking-the-exam-1.html">Retaking the exam</a></li></ul></li><li><a href="../16325/faqs-1.html">FAQs</a></li></ul></li><li><a href="../3147/ib-core-1.html">IB Core</a><ul class="level-1"><li><a href="../3149/learner-profile-1.html">Learner Profile</a></li><li><a href="../21735/extended-essays--1.html" class="father">Extended Essays </a><ul class="level-2"><li><a href="../21736/overview--1.html">Overview </a></li><li><a href="../21780/responsibilities-1.html">Responsibilities</a></li><li><a href="../21790/resources-1.html">Resources</a></li><li><a href="../21800/research-1.html">Research</a></li><li><a href="../21804/writing-the-essay-1.html">Writing the essay</a></li><li><a href="../21810/assessment-1.html">Assessment</a></li><li><a href="../22434/summary-of-advice--1.html">Summary of advice </a></li><li><a href="../25272/faqs--1.html">FAQs </a></li></ul></li><li><a href="../307/theory-of-knowledge-tok-1.html" class="father">Theory of Knowledge (TOK)</a><ul class="level-2"><li><a href="../41171/the-12-tok-concepts-1.html">The 12 TOK concepts</a></li><li><a href="../3507/why-tok-chemistry-1.html">Why TOK & Chemistry?</a></li><li><a href="../3505/a-modern-paradigm-1.html">A modern paradigm</a></li></ul></li></ul></li><li><a href="../17783/fast-track-to-tests-questions-1.html">Fast track to tests & questions</a><ul class="level-1"><li><a href="../17784/sl-multiple-choice-tests-on-individual-topics-1.html">SL Multiple choice tests on individual topics</a></li><li><a href="../24351/sl-multiple-choice-quizzes-on-sub-topics-1.html">SL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31519/sl-practice-paper-1-exams-1.html">SL Practice Paper 1 exams</a></li><li><a href="../17786/sl-questions-on-each-sub-topic-1.html">SL Questions on each sub-topic</a></li><li><a href="../20431/sl-paper-3-section-a-questions-1.html">SL Paper 3 Section A questions</a></li><li><a href="../17792/sl-questions-on-the-options-1.html">SL Questions on the options</a></li><li><a href="../24897/sl-quizzes-on-option-sub-topics--1.html">SL Quizzes on option sub-topics </a></li><li><a href="../17785/hl-multiple-choice-tests-on-individual-topics-1.html">HL Multiple choice tests on individual topics</a></li><li><a href="../24352/hl-multiple-choice-quizzes-on-sub-topics-1.html">HL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31520/hl-practice-paper-1-exams--1.html">HL Practice Paper 1 exams </a></li><li><a href="../17787/hl-questions-on-each-sub-topic--1.html">HL Questions on each sub-topic </a></li><li><a href="../20428/hl-paper-3-section-a-questions-1.html">HL Paper 3 Section A questions</a></li><li><a href="../17793/hl-questions-on-the-options-1.html">HL Questions on the options</a></li><li><a href="../24973/hl-quizzes-on-option-sub-topics-1.html">HL Quizzes on option sub-topics</a></li><li><a href="../41573/printable-versions-of-written-tasks--1.html">Printable versions of written tasks </a></li></ul></li><li class="selected"><a href="../41465/complete-course-for-students--2.html">Complete course for students </a><ul class="level-1"><li 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Acids and bases </a></li><li><a href="../28031/topics-9-19-redox-process-1.html">Topics 9 & 19 : Redox process</a></li><li><a href="../28061/topics-10-20-organic-chemistry-1.html">Topics 10 & 20 : Organic chemistry</a></li><li><a href="../28038/topics-11-21-measurement-data-processing-analysis-1.html">Topics 11 & 21 : Measurement, data processing & analysis</a></li><li><a href="../28074/option-a-materials--1.html">Option A : Materials </a></li><li><a href="../28087/option-b-biochemistry-1.html">Option B : Biochemistry</a></li><li><a href="../28098/option-c-energy--1.html">Option C : Energy </a></li><li><a href="../28109/option-d-medicinal-chemistry-1.html">Option D : Medicinal chemistry</a></li></ul></li><li><a href="../41553/practical-work-including-ia-group-4-project--1.html" class="father">Practical work (including IA & Group 4 Project) </a><ul class="level-2"><li><a href="../41528/internal-assessment-1.html">Internal Assessment</a></li><li><a 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<nav id="sidemenu" class="side-nav"><div class="header"><span style="color: #fff;"><a href="../41465/complete-course-for-students--2.html">Complete course for students </a></span><span id="sidetreecontrol"><a title="Collapse all" rel="collapse" href="#"><i class="fa fa-minus-circle"></i></a> <a title="Expand all" rel="expand" href="#"><i class="fa fa-plus-circle"></i></a></span></div><ul class="level-0 always-expanded"><li class="ancestor parent" style="padding-left: 0px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a href="../27988/full-coverage-of-each-topic-and-sub-topic-2.html" title="Full coverage of each topic and sub-topic">Full coverage of each topic and sub-topic</a></li><ul class="level-1 expanded"><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../27959/topic-1-stoichiometric-relationships-1.html" title="Topic 1 : Stoichiometric relationships">Topic 1 : Stoichiometric relationships</a></li><ul class="level-2 "><li 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Periodicity</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27966/31-the-periodic-table-1.html" title="3.1 The periodic table">3.1 The periodic table</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27967/32-periodic-trends--1.html" title="3.2 Periodic trends ">3.2 Periodic trends </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27968/131-first-row-d-block-elements-1.html" title="13.1 First-row d-block elements">13.1 First-row d-block elements</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27970/132-coloured-complexes-1.html" title="13.2 Coloured complexes">13.2 Coloured complexes</a></li></ul><li class="ancestor parent" style="padding-left: 14px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a href="../27971/topics-4-14-chemical-bonding-structure-1.html" title="Topics 4 & 14 : Chemical bonding & structure">Topics 4 & 14 : Chemical bonding & structure</a></li><ul class="level-2 expanded"><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27972/41-ionic-bonding-structure--1.html" title="4.1 Ionic bonding & structure ">4.1 Ionic bonding & structure </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27973/42-covalent-bonding-1.html" title="4.2 Covalent bonding">4.2 Covalent bonding</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27974/43-covalent-structures-1--1.html" title="4.3 Covalent structures (1) ">4.3 Covalent structures (1) </a></li><li class="current" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="43-covalent-structures-2--1.html" title="4.3 Covalent structures (2) ">4.3 Covalent structures (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27981/44-intermolecular-forces--1.html" title="4.4 Intermolecular forces ">4.4 Intermolecular forces </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27982/45-metallic-bonding--1.html" title="4.5 Metallic bonding ">4.5 Metallic bonding </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27983/141-further-aspects-of-covalent-bonding-1.html" title="14.1 Further aspects of covalent bonding">14.1 Further aspects of covalent bonding</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27985/142-hybridization-1.html" title="14.2 Hybridization">14.2 Hybridization</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../27987/topics-5-15-energeticsthermochemistry-1.html" title="Topics 5 & 15 : Energetics/thermochemistry">Topics 5 & 15 : Energetics/thermochemistry</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27989/51-measuring-energy-changes-1.html" title="5.1 Measuring energy changes">5.1 Measuring energy changes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27991/52-hesss-law-1.html" title="5.2 Hess's Law">5.2 Hess's Law</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27992/53-bond-enthalpies--1.html" title="5.3 Bond enthalpies ">5.3 Bond enthalpies </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27993/151-energy-cycles-1.html" title="15.1 Energy cycles">15.1 Energy cycles</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27994/152-entropy-spontaneity-1.html" title="15.2 Entropy & spontaneity">15.2 Entropy & spontaneity</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../27995/topics-6-16-chemical-kinetics-1.html" title="Topics 6 & 16 : Chemical kinetics">Topics 6 & 16 : Chemical kinetics</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27996/61-collision-theory-rates-of-reaction-1.html" title="6.1 Collision theory & rates of reaction">6.1 Collision theory & rates of reaction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27997/161-rate-expression-reaction-mechanism-1.html" title="16.1 Rate expression & reaction mechanism">16.1 Rate expression & reaction mechanism</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27998/162-activation-energy-1.html" title="16.2 Activation energy">16.2 Activation energy</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28001/topics-7-17-equilibrium--1.html" title="Topics 7 & 17 : Equilibrium ">Topics 7 & 17 : Equilibrium </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27999/71-equilibrium-1.html" title="7.1 Equilibrium">7.1 Equilibrium</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28000/171-equilibrium-law-1.html" title="17.1 Equilibrium law">17.1 Equilibrium law</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28017/topics-8-18-acids-and-bases--1.html" title="Topics 8 & 18 : Acids and bases ">Topics 8 & 18 : Acids and bases </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28002/81-theories-of-acids-bases-1.html" title="8.1 Theories of acids & bases">8.1 Theories of acids & bases</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28010/82-properties-of-acids-bases-1.html" title="8.2 Properties of acids & bases">8.2 Properties of acids & bases</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28011/83-ph-scale-1.html" title="8.3 pH scale">8.3 pH scale</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28012/84-strong-weak-acids-bases-1.html" title="8.4 Strong & weak acids & bases">8.4 Strong & weak acids & bases</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28013/85-acid-deposition--1.html" title="8.5 Acid deposition ">8.5 Acid deposition </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28014/181-lewis-acids-bases--1.html" title="18.1 Lewis acids & bases ">18.1 Lewis acids & bases </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28015/182-calculations-involving-acids-bases--1.html" title="18.2 Calculations involving acids & bases ">18.2 Calculations involving acids & bases </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28016/183-ph-titration-curves-1.html" title="18.3 pH titration curves">18.3 pH titration curves</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28031/topics-9-19-redox-process-1.html" title="Topics 9 & 19 : Redox process">Topics 9 & 19 : Redox process</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28021/91-oxidation-reduction-1.html" title="9.1 Oxidation & reduction">9.1 Oxidation & reduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28022/92-electrochemical-cells-1.html" title="9.2 Electrochemical cells">9.2 Electrochemical cells</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28023/191-electrochemical-cells-ahl-1.html" title="19.1 Electrochemical cells (AHL)">19.1 Electrochemical cells (AHL)</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28061/topics-10-20-organic-chemistry-1.html" title="Topics 10 & 20 : Organic chemistry">Topics 10 & 20 : Organic chemistry</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28042/101-fundamentals-of-organic-chemistry-1.html" title="10.1 Fundamentals of organic chemistry">10.1 Fundamentals of organic chemistry</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28043/1021-alkanes-alkenes-addition-polymers-1.html" title="10.2(1) Alkanes, alkenes & addition polymers">10.2(1) Alkanes, alkenes & addition polymers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28044/1022-alcohols--1.html" title="10.2(2) Alcohols ">10.2(2) Alcohols </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28047/1023-halogenoalkanes-benzene-1.html" title="10.2(3) Halogenoalkanes & benzene">10.2(3) Halogenoalkanes & benzene</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28050/2011-nucleophilic-substitution--1.html" title="20.1(1) Nucleophilic substitution ">20.1(1) Nucleophilic substitution </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28051/2012-electrophilic-addition--1.html" title="20.1(2) Electrophilic addition ">20.1(2) Electrophilic addition </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28053/2013-electrophilic-substitution-1.html" title="20.1(3) Electrophilic substitution">20.1(3) Electrophilic substitution</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28054/2014-reduction-reactions--1.html" title="20.1(4) Reduction reactions ">20.1(4) Reduction reactions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28056/202-synthetic-routes--1.html" title="20.2 Synthetic routes ">20.2 Synthetic routes </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28059/203-stereoisomerism--1.html" title="20.3 Stereoisomerism ">20.3 Stereoisomerism </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28038/topics-11-21-measurement-data-processing-analysis-1.html" title="Topics 11 & 21 : Measurement, data processing & analysis">Topics 11 & 21 : Measurement, data processing & analysis</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28032/111-uncertainty-errors--1.html" title="11.1 Uncertainty & errors ">11.1 Uncertainty & errors </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28033/112-graphical-techniques-1.html" title="11.2 Graphical techniques">11.2 Graphical techniques</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28034/113-spectroscopic-identification-of-organic-compounds-1.html" title="11.3 Spectroscopic identification of organic compounds">11.3 Spectroscopic identification of organic compounds</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28039/211-spectroscopic-identification-of-organic-compounds-ahl-1.html" title="21.1 Spectroscopic identification of organic compounds (AHL)">21.1 Spectroscopic identification of organic compounds (AHL)</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28074/option-a-materials--1.html" title="Option A : Materials ">Option A : Materials </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28062/a1-introduction-to-materials-science--1.html" title="A.1 Introduction to materials science ">A.1 Introduction to materials science </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28063/a2-metals-and-icp-spectroscopy-1.html" title="A.2 Metals and ICP spectroscopy">A.2 Metals and ICP spectroscopy</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28065/a3-catalysts--1.html" title="A.3 Catalysts ">A.3 Catalysts </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28066/a4-liquid-crystals-1.html" title="A.4 Liquid crystals">A.4 Liquid crystals</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28067/a5-polymers-1.html" title="A.5 Polymers">A.5 Polymers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28069/a6-nanotechnology-1.html" title="A.6 Nanotechnology">A.6 Nanotechnology</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28070/a7-environmental-impact-plastics-1.html" title="A.7 Environmental impact - plastics">A.7 Environmental impact - plastics</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28071/a8-superconducting-metals-x-ray-crystallography--1.html" title="A.8 Superconducting metals & X-ray crystallography ">A.8 Superconducting metals & X-ray crystallography </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28072/a9-condensation-polymers-1.html" title="A.9 Condensation polymers">A.9 Condensation polymers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28073/a10-environmental-impact-heavy-metals-1.html" title="A.10 Environmental impact - heavy metals">A.10 Environmental impact - heavy metals</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28087/option-b-biochemistry-1.html" title="Option B : Biochemistry">Option B : Biochemistry</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28076/b1-introduction-to-biochemistry--1.html" title="B.1 Introduction to biochemistry ">B.1 Introduction to biochemistry </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28078/b2-proteins-enzymes-1.html" title="B.2 Proteins & enzymes">B.2 Proteins & enzymes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28079/b3-lipids-1.html" title="B.3 Lipids">B.3 Lipids</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28080/b4-carbohydrates-1.html" title="B.4 Carbohydrates">B.4 Carbohydrates</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28081/b5-vitamins-1.html" title="B.5 Vitamins">B.5 Vitamins</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28082/b6-biochemistry-the-environment-1.html" title="B.6 Biochemistry & the environment">B.6 Biochemistry & the environment</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28083/b7-proteins-enzymes-ahl--1.html" title="B.7 Proteins & enzymes (AHL) ">B.7 Proteins & enzymes (AHL) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28084/b8-nucleic-acids-1.html" title="B.8 Nucleic acids">B.8 Nucleic acids</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28085/b9-biological-pigments-1.html" title="B.9 Biological pigments">B.9 Biological pigments</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28086/b10-stereochemistry-in-biomolecules-1.html" title="B.10 Stereochemistry in biomolecules">B.10 Stereochemistry in biomolecules</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28098/option-c-energy--1.html" title="Option C : Energy ">Option C : Energy </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28088/c1-energy-sources--1.html" title="C.1 Energy sources ">C.1 Energy sources </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28089/c2-fossil-fuels-1.html" title="C.2 Fossil fuels">C.2 Fossil fuels</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28090/c3-nuclear-fusion-nuclear-fission-reactions-1.html" title="C.3 Nuclear fusion & nuclear fission reactions">C.3 Nuclear fusion & nuclear fission reactions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28091/c4-solar-energy--1.html" title="C.4 Solar energy ">C.4 Solar energy </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28094/c5-environmental-impact-global-warming--1.html" title="C.5 Environmental impact - global warming ">C.5 Environmental impact - global warming </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28095/c6-electrochemistry-rechargeable-batteries-fuel-cells-1.html" title="C.6 Electrochemistry, rechargeable batteries & fuel cells">C.6 Electrochemistry, rechargeable batteries & fuel cells</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28096/c7-nuclear-fusion-fission-hl--1.html" title="C.7 Nuclear fusion & fission (HL) ">C.7 Nuclear fusion & fission (HL) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28097/c8-photovoltaic-cells-and-dsscs-1.html" title="C.8 Photovoltaic cells and DSSCs">C.8 Photovoltaic cells and DSSCs</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../28109/option-d-medicinal-chemistry-1.html" title="Option D : Medicinal chemistry">Option D : Medicinal chemistry</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28099/d1-pharmaceutical-products-drug-action--1.html" title="D.1 Pharmaceutical products & drug action ">D.1 Pharmaceutical products & drug action </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28100/d2-aspirin-penicillin-1.html" title="D.2 Aspirin & penicillin">D.2 Aspirin & penicillin</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28101/d3-opiates-1.html" title="D.3 Opiates">D.3 Opiates</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28103/d4-ph-regulation-of-the-stomach-1.html" title="D.4 pH regulation of the stomach">D.4 pH regulation of the stomach</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28102/d5-antiviral-medications-1.html" title="D.5 Antiviral medications">D.5 Antiviral medications</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28104/d6-environmental-impact-of-some-medications-1.html" title="D.6 Environmental impact of some medications">D.6 Environmental impact of some medications</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28105/d7-taxol-a-chiral-auxiliary-case-study--1.html" title="D.7 Taxol - a chiral auxiliary case study ">D.7 Taxol - a chiral auxiliary case study </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28107/d8-nuclear-medicine--1.html" title="D.8 Nuclear medicine ">D.8 Nuclear medicine </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../28108/d9-drug-detection-analysis-1.html" title="D.9 Drug detection & analysis">D.9 Drug detection & analysis</a></li></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../41553/practical-work-including-ia-group-4-project--1.html" title="Practical work (including IA & Group 4 Project) ">Practical work (including IA & Group 4 Project) </a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41528/internal-assessment-1.html" title="Internal Assessment">Internal Assessment</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41529/scaffolding-the-investigation-1.html" title="'Scaffolding' the investigation">'Scaffolding' the investigation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41531/choosing-the-research-question-1.html" title="Choosing the research question">Choosing the research question</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41532/personal-engagement--1.html" title="Personal engagement ">Personal engagement </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41533/exploration-1.html" title="Exploration">Exploration</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41544/analysis--1.html" title="Analysis ">Analysis </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41545/significant-figures--1.html" title="Significant figures ">Significant figures </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41547/error-uncertainty-1.html" title="Error & uncertainty">Error & uncertainty</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41548/evaluation--1.html" title="Evaluation ">Evaluation </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41549/communication-1.html" title="Communication">Communication</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41550/genuine-examples-of-marked-ia-reports--1.html" title="Genuine examples of marked IA reports ">Genuine examples of marked IA reports </a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41657/group-4-project-1.html" title="Group 4 Project">Group 4 Project</a></li></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../41387/approaches-to-learning--1.html" title="Approaches to learning ">Approaches to learning </a></li><ul class="level-1 "><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41380/thinking-skills-1.html" title="Thinking skills">Thinking skills</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41383/communication-skills-1.html" title="Communication skills">Communication skills</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41384/social-skills--1.html" title="Social skills ">Social skills </a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41385/self-management-skills-1.html" title="Self-management skills">Self-management skills</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41386/research-skills-1.html" title="Research skills">Research skills</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41382/reflection-skills--1.html" title="Reflection skills ">Reflection skills </a></li></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../41488/the-nature-of-science-1.html" title="The Nature of Science">The Nature of Science</a></li><ul class="level-1 "><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41489/key-terms-concepts--1.html" title="Key terms & concepts ">Key terms & concepts </a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41492/how-the-elements-were-named--1.html" title="How the elements were named ">How the elements were named </a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41490/nos-critical-thinking-1.html" title="NOS & Critical Thinking">NOS & Critical Thinking</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41493/the-culture-of-chemistry--1.html" title="The Culture of Chemistry ">The Culture of Chemistry </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41500/culture-of-chemistry-1-1.html" title="Culture of Chemistry (1)">Culture of Chemistry (1)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41501/culture-of-chemistry-2-1.html" title="Culture of Chemistry (2)">Culture of Chemistry (2)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41502/culture-of-chemistry-3-1.html" title="Culture of Chemistry (3)">Culture of Chemistry (3)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41503/culture-of-chemistry-4--1.html" title="Culture of Chemistry (4) ">Culture of Chemistry (4) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41504/culture-of-chemistry-5-1.html" title="Culture of Chemistry (5)">Culture of Chemistry (5)</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41494/nature-of-science-questions--1.html" title="Nature of Science questions ">Nature of Science questions </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41498/nos-question-example-1--1.html" title="NoS question - Example 1 ">NoS question - Example 1 </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41499/nos-question-example-2--1.html" title="NoS question - Example 2 ">NoS question - Example 2 </a></li></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../41401/external-assessment-exams-1.html" title="External assessment (Exams)">External assessment (Exams)</a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41403/essential-facts--1.html" title="Essential Facts ">Essential Facts </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41404/objectives-command-terms--1.html" title="Objectives & command terms ">Objectives & command terms </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41408/grade-boundaries--1.html" title="Grade boundaries ">Grade boundaries </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41406/grade-descriptors--1.html" title="Grade descriptors ">Grade descriptors </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41451/your-final-grade-not-good-enough-for-you--1.html" title="Your final grade not good enough for you? ">Your final grade not good enough for you? </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41409/paper-1-multiple-choice--1.html" title="Paper 1 (Multiple Choice) ">Paper 1 (Multiple Choice) </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41415/advice-to-students-paper-1--1.html" title="Advice to students (Paper 1) ">Advice to students (Paper 1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41416/practice-paper-1-exams--1.html" title="Practice Paper 1 exams ">Practice Paper 1 exams </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41417/paper-2--1.html" title="Paper 2 ">Paper 2 </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41418/advice-to-students-paper-2--1.html" title="Advice to students (Paper 2) ">Advice to students (Paper 2) </a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41419/areas-of-difficulty--1.html" title="Areas of difficulty ">Areas of difficulty </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41426/understanding-the-activity-series-1.html" title="Understanding the activity series">Understanding the activity series</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41422/vsepr-1.html" title="VSEPR">VSEPR</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41421/ie-graphs--1.html" title="IE graph(s) ">IE graph(s) </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41420/misuse-of-formulas--1.html" title="Misuse of formulas ">Misuse of formulas </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41425/manipulating-equilibrium-constants--1.html" title="Manipulating equilibrium constants ">Manipulating equilibrium constants </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41428/curly-arrows-1.html" title="'Curly arrows'">'Curly arrows'</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41424/understanding-and-using-g--1.html" title="Understanding and using ΔG ">Understanding and using Δ<em>G </em> </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41430/factors-affecting-the-rate-of-nucleophilic-substitution-reaction-1.html" title="Factors affecting the rate of nucleophilic substitution reactions ">Factors affecting the rate of nucleophilic substitution reactions </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41427/using-electrode-potentials--1.html" title="Using electrode potentials ">Using electrode potentials </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41429/understanding-hybridization--1.html" title="Understanding hybridization ">Understanding hybridization </a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41431/paper-3--1.html" title="Paper 3 ">Paper 3 </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41432/advice-to-students-paper-3--1.html" title="Advice to students (Paper 3) ">Advice to students (Paper 3) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41433/data-response-questions--1.html" title="Data response questions ">Data response questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41441/experimental-work-questions--1.html" title="Experimental work questions ">Experimental work questions </a></li></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../41662/extended-essay--1.html" title="Extended Essay ">Extended Essay </a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41685/preparation-1.html" title="Preparation">Preparation</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41663/aims-objectives-1.html" title="Aims & objectives">Aims & objectives</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41665/your-responsibilities-1.html" title="Your responsibilities">Your responsibilities</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../41785/choosing-the-subject-1.html" title="Choosing the subject">Choosing the subject</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41686/researching--1.html" title="Researching ">Researching </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42069/choosing-the-research-topic--1.html" title="Choosing the research topic ">Choosing the research topic </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42070/framing-the-research-question-1.html" title="Framing the Research Question">Framing the Research Question</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42072/researching-your-essay-1.html" title="Researching your Essay">Researching your Essay</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42097/reflections-on-planning-and-progress--1.html" title="Reflections on planning and progress ">Reflections on planning and progress </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../42075/writing-the-essay-1.html" title="Writing the essay">Writing the essay</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42077/correct-referencing-and-bibliography-1.html" title="Correct referencing and bibliography">Correct referencing and bibliography</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42092/checklist--1.html" title="Checklist ">Checklist </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../41687/assessment-1.html" title="Assessment">Assessment</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42166/grading-system-1.html" title="Grading system">Grading system</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42159/criterion-a--1.html" title="Criterion A ">Criterion A </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42161/criterion-b-1.html" title="Criterion B">Criterion B</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42163/criterion-c-1.html" title="Criterion C">Criterion C</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../42164/criterion-d--1.html" title="Criterion D ">Criterion D </a></li><li class="" 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</div><section id="main-content"><div id="toc-1672969212" class="toc"><a href="#" class="toc-switcher" title="Show table of contents"><small><i class="fa fa-reorder"></i> Table of contents <span class="pull-right"><i class="fa fa-chevron-down"></i></span></small></a></div><p>This is the second part of 4.3 Covalent structures and looks at VSEPR theory to determine the shapes of simple molecules and ions. Since the underlying theory is the same it also includes 5 and 6 electrons pairs around the central atom which is on the Higher Level programme under 14.1.</p><hr class="hidden"><div class="box"><h2><img alt="" src="../../../ib/chemistry/images/student-learning/trigonal-planar(1).png" style="width: 2px; height: 1px;"><img alt="" height="21" src="../../../img/tib-icons/standard-level-32-1.png" title="" width="21"> <img alt="" height="21" src="../../../img/tib-icons/higher-level-32-1.png" title="" width="21"> Learning outcomes</h2><p>After studying this topic you should be able to:</p><p><strong><strong><img alt="" class="noborder" src="../../../ib/chemistry/images/student-learning/trigonal-planar(1).png" style="float: right; width: 400px; height: 284px;">Understand:</strong></strong></p><ul><li>Shapes of simple molecules and ions are determined by the repulsion of electron pairs according to <strong>V</strong>alence <strong>S</strong>hell <strong>E</strong>lectron<strong> P</strong>air <strong>R</strong>epulsion theory (VSEPR theory).</li></ul><p><strong>Apply your knowledge to:</strong></p><ul><li>Use VSEPR theory to predict the electron domain geometry and the molecular geometry for species with two, three and four electron domains.</li><li>Predict bond angles from molecular geometry and the presence of non-bonding pairs of electrons.</li><li>Predict molecular polarity from bond polarity and molecular geometry.</li><li><img alt="laugh" height="16" src="../../../img/tib-icons/higher-level-16-1.png" title="laugh" width="16"> only: Deduce using VSEPR theory the electron domain geometry and molecular geometry with five and six electron domains and associated bond angles.<hr class="hidden"></li></ul></div><hr class="hidden"><div class="blueBg"><h2>Relationships & vocabulary</h2><h4>Nature of science</h4><p>Models are used by scientists as representations of the real world—VSEPR (the model of the shapes of simple molecules and ions) has been developed to explain observable properties.</p><hr class="hidden"><h4>International-mindedness</h4><p>For examples and links to <em>International mindedness, Theory of knowledge, utilization etc. </em>see <a href="../17055/topics-4-14--1.html" title="Core & AHL » Incorporating IM, TOK, 'Utilization' etc. » Topics 4 & 14 ">separate page</a> which covers all of Topics 4 & 14: Chemical bonding & structure.</p><hr class="hidden"><h4>Vocabulary</h4><table><tbody><tr><td>electron domain</td><td>tetrahedral</td><td>bent (or V-shaped)</td><td>trigonal planar</td><td>trigonal pyramid</td></tr><tr><td>octahedral</td><td>square planar</td><td>orthogonal</td><td>trigonal bipyramid</td><td>see-saw</td></tr></tbody></table><hr class="hidden"></div><hr class="hidden"><div class="greenBg"><h2>Learning slides</h2><p>You can use this slide gallery for learning or for reviewing concepts and information. It covers all the key points in the syllabus for this sub-topic.</p><div id="myCarousel-14" class="carousel slide" data-id="241"><!-- Carousel items --><div class="carousel-inner"><div class="active item"><a class="fancy" href="../../../tib-galleries/3-241/432-1.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-1.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-2.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-2.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/replacement.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/replacement.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-4.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-4.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-5.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-5.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-6.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-6.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-7.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-7.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-8.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-8.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-9.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-9.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-10.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-10.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-11.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-11.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-12.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-12.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-13.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-13.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-14.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-14.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-15.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-15.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/432-16.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/432-16.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-241/17.png" rel="gallery-241" title=""><img alt="" src="files/tib-galleries/3-241/17.png"></a><div class="carousel-caption"><p>Covalent structures (2): </p></div></div></div><!-- Carousel nav --><a class="carousel-control left" href="#myCarousel-14" data-slide="prev">‹</a><a class="carousel-control right" href="#myCarousel-14" data-slide="next">›</a><div class="tib-indicators"><img class="" title="Click to view" style="margin: 10px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-1-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-2-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/replacement-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-4-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-5-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-6-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-7-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-8-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-9-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-10-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-11-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-12-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-13-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-14-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-15-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/432-16-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-241/17-thumb128.jpg"></div></div><p> </p></div><hr class="hidden"><div class="pinkBg"><div><h2>Something to think about</h2><p>Part of sub-topic 4.3 is to predict the bond angles in species with two, three and four electrons domains. The classic example used for both Standard and Higher Level students is to compare the bond angles in methane, ammonia and water. It all seems highly logical. In methane all the four pairs of electrons (electron domains) are bonding pairs so repel each other equally to give a regular tetrahedron with bond angles of 109.5<sup>o</sup>. Ammonia contains one non-bonding pair which repels bonding pairs more than other bonding pairs so the bond angle decreases to about 108<sup>o </sup>in the trigonal pyramid molecule. The two non-bonding pairs in water cause even more repulsion so the bond angle in the bent molecule decreases further to about 104.5<sup>o</sup>. This can be found in all the text books and the theory perfectly matches the experimentally found bond angles.</p><p style="text-align: center; "><img alt="" class="noborder" src="../../../ib/chemistry/images/2014%20Core%20%26%20AHL/Topics%204%20%26%2014/ammonia.png" style="width: 240px; height: 133px;"> <img alt="" class="noborder" src="../../../ib/chemistry/images/2014%20Core%20%26%20AHL/Topics%204%20%26%2014/water.svg.png" style="width: 250px; height: 109px;"></p><p>However this is yet another case of where the IB (and other pre-university courses) conveniently does not explore further as the logic appears flawed. Consider applying the same logic to phosphorus trichloride. Like ammonia there are three bonding pairs and only one non-bonding pair so one would expect the bond angle to be just less than 109.5<sup>o</sup> and more than 104.5<sup>o</sup>. In fact the bond angle is 100<sup>o</sup>. You might argue that it is the chlorine that perhaps makes the difference. So let's look at phosphine where the only difference with ammonia is that a phosphorus atom has replaced the nitrogen atom. The bond angle of 93.5<sup>o</sup> is even lower than phosphorus trichloride and considerably lower than the H-O-H bond angle in water where there are two non-bonding pairs.</p><p style="text-align: center; "><img alt="" class="noborder" height="162" src="../../../ib/chemistry/images/Core and AHL/Bonding/PCl3.png" title="Phosphorus trichloride molecule (image from Wikimedia commons)" width="250"> <img alt="" class="noborder" height="164" src="../../../ib/chemistry/images/Core and AHL/Bonding/Phosphine.png" title="Phosphine molecule (image from Wikimedia commons)" width="150"></p><p>An astute student might argue that the bond angle also depends upon the period where the central atom is located since nitrogen and oxygen are in period 2 and phosphorus is in period 3. There is some truth in this. What would you expect the bond angle in hydrogen sulfide to be? On the simple theory it might be expected to be similar to water i.e. about 104.5<sup>o</sup>. If we now use what we know about phosphine then we might expect it to be a little less than 93.5<sup>o</sup>. Guess what - it is 92.1<sup>o </sup>- our new theory works! We could extend this and try to predict the bond angle for sulfur dichloride. Using our new logic we might expect it to be perhaps one or two degrees less than the 100<sup>o</sup> in phosphorus trichloride as there are now two non-bonding pairs of electrons? Wrong! It is 103<sup>o</sup>.</p><p style="text-align: center; "><img alt="" class="noborder" src="../../../ib/chemistry/images/2014%20Core%20%26%20AHL/Topics%204%20%26%2014/hydrogen-sulfide-2d-dimensions.svg.png" style="width: 230px; height: 129px;"> <img alt="" class="noborder" height="131" src="../../../ib/chemistry/images/Core and AHL/Bonding/Sulfur-dichloride-2D-dimensions.png" title="Sulfur dichloride molecule (image from Wikimedia commons)" width="250"></p><p>Clearly it is not nearly as simple as it is made out. Can you really be expected to predict these bond angles so that they agree with the experimentally determined values?</p><hr class="hidden"><p>I don't think so!!</p><hr class="hidden"></div></div><hr class="hidden"><div class="yellowBg"><h2>Test your understanding of this topic</h2><p><em>(Note that your teacher may have restricted your access to some or all of these questions and worked answers if they are going to use them as a class test or set them as an assignment.)</em></p><hr class="hidden"><p>For ten 'quiz' multiple choice questions with the answers explained see <a href="../24481/mc-test-covalent-structures-2--1.html" title="Core & AHL » Teaching each topic & sub-topic » Topics 4 & 14 » Covalent structures (2) » MC test: Covalent structures (2) ">MC test: Covalent structures (2)</a>.</p><p>For short-answer questions see <a href="../40918/shapes-polarity-questions.html" title="Core & AHL » Teaching each topic & sub-topic » Topics 4 & 14 » Covalent structures (2) » Shapes & polarity questions">Shapes & polarity questions</a>.</p><hr class="hidden"></div><hr class="hidden"><div class="blueBg"><h2><span style="font-weight: bold;">More resources</span></h2><p><strong>1. </strong>A rather nice animation of shapes by a student - Ashley Jennings</p><p style="text-align: center; "><iframe allowfullscreen="" frameborder="0" height="280" src="//www.youtube.com/embed/i3FCHVlSZc4?rel=0" width="360"></iframe></p><p style="text-align: center; "><a href="youtu.be/i3FCHVlSZc4" target="_blank" title="Videos"><img class="ico" src="../../../img/icons/video-1.png"><span class="anchor" id="video-1" name="video-1"> </span> VSEPR theory </a></p><hr class="hidden"><p><strong>2.</strong> A tutorial by Joey Smokey from Clark College Tutoring and Writing Center. This is just a lecture but the diagrams of the shapes are very clear.</p><p style="text-align: center; "><iframe allowfullscreen="" frameborder="0" height="280" src="//www.youtube.com/embed/QwpH0fEwwmo?rel=0" width="360"></iframe></p><p style="text-align: center; "><a href="youtu.be/QwpH0fEwwmo" target="_blank" title="Videos"><img class="ico" src="../../../img/icons/video-1.png"><span class="anchor" id="video-2" name="video-2"> </span> Molecular shapes</a></p><hr class="hidden"><p style="text-align: center; "></p></div></section></article><section id="media-extras"><div class="page-actions no-print navbar inline hidden-desktop"><div class="navbar-inner"><ul class="nav"><li><a class="presentation" href="#" onclick="return false;"><i class="fa fa-desktop"></i></a></li><li><a class="print-section-blog" href="#" onclick="return false;"><i class="fa fa-print"></i></a></li><li><a class="page-bookmarker" data-ticket="IB Docs (2) Team" data-pid="27980" href="#" onclick="return false;"><i class="fa fa-star"></i></a></li><li><a class="personal-notes" href="#" onclick="return false;"><i class="fa fa-file-text"></i></a></li><li><a class="" data-toggle="modal" href="#modal-feedback" onclick="return false;"><i class="fa fa-envelope-o"></i></a></li><li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" data-target="#" href="#"><i class="fa fa-share-alt"></i></a><ul class="dropdown-menu" role="menu"><li><a class="" target="_blank" title="Share on Twitter" href="https://twitter.com/share?text=%224.3+Covalent+structures+%282%29+%22+-+via+%40InThinker+%23chemistry%0A&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F27980%2F43-covalent-structures-2-"><i class="fa fa-twitter-square"></i><span>Twitter</span></a></li><li><a class="" target="_blank" title="Share on Facebook" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F27980%2F43-covalent-structures-2-&t=4.3+Covalent+structures+(2)+"><i class="fa fa-facebook-square"></i><span>Facebook</span></a></li><li><a class="" href="http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F27980%2F43-covalent-structures-2-"><i class="fa fa-linkedin-square"></i><span>LinkedIn</span></a></li><li><a class="" href="https://plus.google.com/share?url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F27980%2F43-covalent-structures-2-"><i class="fa fa-google-plus-square"></i><span>Google +</span></a></li><li><a class="" href="mailto:?subject=4.3 Covalent structures (2) &body=This is the second part of 4.3 Covalent structures and looks at VSEPR theory to determine the shapes of simple molecules and ions. 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