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class="father">Teaching each topic & sub-topic</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16328/topic-1" >Topic 1</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16907/topics-2-12-" >Topics 2 & 12 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17021/topics-3-13" >Topics 3 & 13</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17114/topics-4-14" >Topics 4 & 14</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17669/topics-5-15-" >Topics 5 & 15 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17848/topics-6-16" >Topics 6 & 16</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18038/topics-7-17-" >Topics 7 & 17 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18120/topics-8-18-" >Topics 8 & 18 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18350/topics-9-19" >Topics 9 & 19</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18475/topics-10-20-" >Topics 10 & 20 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17285/topics-11-21-" >Topics 11 & 21 </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16441/the-nature-of-science" class="father">The Nature of Science</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16450/key-terms-concepts" >Key terms & concepts</a></li><li ><a href="https://www.thinkib.net/chemistry/page/34566/nos-critical-thinking" >NOS & Critical Thinking</a></li><li ><a href="https://www.thinkib.net/chemistry/page/32100/how-the-elements-were-named" >How the elements were named</a></li><li ><a href="https://www.thinkib.net/chemistry/page/36753/the-culture-of-chemistry" >The Culture of Chemistry</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17333/nature-of-science-questions" >Nature of Science questions</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16413/incorporating-im-tok-utilization-etc" class="father">Incorporating IM, TOK, 'Utilization' etc.</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16414/topic-1" >Topic 1</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16916/topics-2-12" >Topics 2 & 12</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17023/topics-3-13-" >Topics 3 & 13 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17055/topics-4-14-" >Topics 4 & 14 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17270/topics-5-15-" >Topics 5 & 15 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17854/topics-6-16-" >Topics 6 & 16 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18041/topics-7-17-" >Topics 7 & 17 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18099/topics-8-18" >Topics 8 & 18</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18349/topics-9-19-" >Topics 9 & 19 </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18420/topics-10-20" >Topics 10 & 20</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17269/topics-11-21-" >Topics 11 & 21 </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/17866/utilization-relationships-between-topics-" class="father">'Utilization' - Relationships between topics </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/17867/relating-topics-4-14-to-all-the-other-topics" >Relating Topics 4 & 14 to all the other topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17868/example-of-connections" >Example of connections</a></li><li ><a href="https://www.thinkib.net/chemistry/page/34404/hydroxychloroquine-ib-chemistry" >Hydroxychloroquine & IB Chemistry</a></li><li ><a href="https://www.thinkib.net/chemistry/page/35418/ammonium-nitrate-ib-chemistry" >Ammonium nitrate & IB Chemistry</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16685/multiple-choice-tests-for-each-topic" class="father">Multiple choice tests for each topic</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16687/sl-questions-by-topic" >SL Questions by topic</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16688/hl-questions-by-topic" >HL Questions by topic</a></li></ul></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/19044/options-" >Options </a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/19503/option-a-" class="father">Option A </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/19504/introduction-to-materials-science-" >Introduction to materials science </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19519/metals-and-icp-spectroscopy" >Metals and ICP spectroscopy</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19541/catalysts-" >Catalysts </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19580/liquid-crystals" >Liquid crystals</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19665/polymers-" >Polymers </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19672/nanotechnology" >Nanotechnology</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19843/environmental-impact-plastics" >Environmental impact - plastics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19858/superconducting-metals-x-ray-crystallography-" >Superconducting metals & X-ray crystallography </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19666/condensation-polymers" >Condensation polymers</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19916/environmental-impact-heavy-metals" >Environmental impact - heavy metals</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/19284/option-b-" class="father">Option B </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/19290/introduction-to-biochemistry-" >Introduction to biochemistry </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19287/proteins-enzymes-" >Proteins & enzymes </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19291/lipids" >Lipids</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19299/carbohydrates-" >Carbohydrates </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19305/vitamins-" >Vitamins </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19313/biochemistry-the-environment-" >Biochemistry & the environment </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19336/proteins-enzymes-ahl-" >Proteins & enzymes (AHL) </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19347/nucleic-acids-" >Nucleic acids </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19361/biological-pigments-" >Biological pigments </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19366/stereochemistry-in-biomolecules" >Stereochemistry in biomolecules</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/19390/option-c-" class="father">Option C </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/19391/energy-sources" >Energy sources</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19407/fossil-fuels" >Fossil fuels</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19411/nuclear-fusion-nuclear-fission-reactions" >Nuclear fusion & nuclear fission reactions</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19429/solar-energy" >Solar energy</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19437/environmental-impact-global-warming" >Environmental impact - global warming</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19453/electrochemistry-rechargeable-batteries-fuel-cells" >Electrochemistry, rechargeable batteries & fuel cells</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19458/nuclear-fusion-fission-hl-" >Nuclear fusion & fission (HL) </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19470/photovoltaic-cells-and-dsscs" >Photovoltaic cells and DSSCs</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/19078/option-d" class="father">Option D</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/19079/pharmaceutical-products-drug-action-" >Pharmaceutical products & drug action </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19158/aspirin-penicillin-" >Aspirin & penicillin </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19174/opiates" >Opiates</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19184/ph-regulation-of-the-stomach" >pH regulation of the stomach</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19194/antiviral-medications-" >Antiviral medications </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19211/environmental-impact-of-some-medications" >Environmental impact of some medications</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19254/taxol-a-chiral-auxiliary-case-study" >Taxol - a chiral auxiliary case study</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19258/nuclear-medicine-" >Nuclear medicine </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19273/drug-detection-analysis-" >Drug detection & analysis </a></li></ul></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16592/practical-scheme-of-work-ia-" >Practical scheme of work & IA </a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/16682/internal-assessment" class="father">Internal Assessment</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/18892/scaffolding-the-investigation" >'Scaffolding' the investigation</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18896/timing-organisation-" >Timing & organisation </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18905/choosing-the-research-question" >Choosing the research question</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18946/personal-engagement" >Personal engagement</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18950/exploration" >Exploration</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18957/analysis" >Analysis</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18965/evaluation" >Evaluation</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18966/communication" >Communication</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19882/internal-standardization-of-the-ia" >Internal standardization of the IA</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19901/submitting-the-samples-for-moderation" >Submitting the samples for moderation</a></li><li ><a href="https://www.thinkib.net/chemistry/page/33754/ten-suggestions-for-ias-using-secondary-data" >Ten suggestions for IAs using secondary data</a></li><li ><a href="https://www.thinkib.net/chemistry/page/37544/gaining-full-marks-for-a-databased-ia-" >Gaining full marks for a databased IA </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19506/ia-example-marking-exercise-" >IA example & marking exercise </a></li><li ><a href="https://www.thinkib.net/chemistry/page/23929/genuine-examples-of-moderated-ia-reports" >Genuine examples of moderated IA reports</a></li><li ><a href="https://www.thinkib.net/chemistry/page/25234/examples-of-teacher-marked-ia-reports-" >Examples of teacher-marked IA reports </a></li><li ><a href="https://www.thinkib.net/chemistry/page/37542/history-of-internal-assessment" >History of Internal Assessment</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16598/mandatory-laboratory-components" class="father">Mandatory laboratory components</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16613/formula-of-magnesium-oxide-" >Formula of magnesium oxide </a></li><li ><a href="https://www.thinkib.net/chemistry/page/16612/determining-the-mr-of-an-unknown-gas" >Determining the <i>M</i><sub>r</sub> of an unknown gas</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16615/acid-base-titrations-" >Acid-base titrations </a></li><li ><a href="https://www.thinkib.net/chemistry/page/16616/a-green-acid-base-practical" >A green acid-base practical</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16617/analysis-of-aspirin-tablets" >Analysis of aspirin tablets</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16618/caco3-in-egg-shells" >CaCO<sub>3</sub> in egg shells</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16644/enthalpy-changes" >Enthalpy changes</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16631/reaction-rates" >Reaction rates</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16635/rate-dependent-factors" >Rate-dependent factors</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16636/determining-ea-for-a-reaction" >Determining <i>E</i><sub>a</sub> for a reaction</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16637/iodination-of-propanone" >Iodination of propanone</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18144/titrations-with-a-ph-meter" >Titrations with a pH meter</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18355/redox-titration-with-kmno4-" >Redox titration with KMnO<sub>4</sub> </a></li><li ><a href="https://www.thinkib.net/chemistry/page/16640/voltaic-cells" >Voltaic cells</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16659/3-d-molecular-modelling-" >3-D molecular modelling </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/17168/other-good-practicals" class="father">Other good practicals</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/17196/common-chemical-reactions" >Common chemical reactions</a></li><li ><a href="https://www.thinkib.net/chemistry/page/227/elements-oxides-of-the-third-period-" >Elements & oxides of the third period </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17239/the-halogens" >The halogens</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17162/boiling-points-of-mixtures" >Boiling points of mixtures</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17170/polarity-of-molecules" >Polarity of molecules</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18083/le-chateliers-principle-" >Le Chatelier's principle </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19582/determining-kc-for-an-esterification-reaction" >Determining <i>K</i><sub>c</sub> for an esterification reaction</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18164/redox-reactions-of-vanadium-" >Redox reactions of vanadium </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18351/chlorine-in-swimming-pools-" >Chlorine in swimming pools </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18178/analysis-of-cuii-ions-in-solution-" >Analysis of Cu(II) ions in solution </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18179/percentage-of-copper-in-brass" >Percentage of copper in brass</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18356/electrolytic-cells-" >Electrolytic cells </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18598/reactions-of-organic-compounds" >Reactions of organic compounds</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18752/hydrolysis-of-halogenoalkanes" >Hydrolysis of halogenoalkanes</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18784/preparation-of-13-dinitrobenzene-" >Preparation of 1,3-dinitrobenzene </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19022/determination-of-an-organic-structure" >Determination of an organic structure</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19887/preparation-of-nylon-66" >Preparation of nylon 6,6</a></li><li ><a href="https://www.thinkib.net/chemistry/page/19343/determination-of-vitamin-c-content-" >Determination of vitamin C content </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19342/hydrolysis-of-starch-" >Hydrolysis of starch </a></li><li ><a href="https://www.thinkib.net/chemistry/page/19159/preparation-purification-of-aspirin-" >Preparation & purification of aspirin </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/18851/ict-in-practical-work" class="father">ICT in practical work</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/18852/data-logging-" >Data logging </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18853/software-for-graph-plotting-" >Software for graph plotting </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18854/spreadsheets-for-data-processing-" >Spreadsheets for data processing </a></li><li ><a href="https://www.thinkib.net/chemistry/page/18855/databases" >Databases</a></li><li ><a href="https://www.thinkib.net/chemistry/page/18856/computer-modelling-simulations-" >Computer modelling & simulations </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16594/group-4-project" class="father">Group 4 Project</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16595/practicalities" >Practicalities</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16596/reflective-statement-" >Reflective statement </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16666/a-new-laboratory" >A new laboratory?</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16284/exams" >Exams</a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/16286/essential-facts" class="father">Essential Facts</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16287/objectives-command-terms" >Objectives & command terms</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16288/grade-descriptors" >Grade descriptors</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16289/grade-boundaries" >Grade boundaries</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16302/paper-1-multiple-choice" class="father">Paper 1 (Multiple Choice)</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16303/advice-to-students-paper-1" >Advice to students (Paper 1)</a></li><li ><a href="https://www.thinkib.net/chemistry/page/31515/practice-paper-1-exams" >Practice Paper 1 exams</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16305/paper-2" class="father">Paper 2</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16306/advice-to-students-paper-2" >Advice to students (Paper 2)</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16307/areas-of-difficulty" >Areas of difficulty</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16313/paper-3-" class="father">Paper 3 </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16314/advice-to-students-paper-3" >Advice to students (Paper 3)</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16342/data-response-questions" >Data response questions</a></li><li ><a href="https://www.thinkib.net/chemistry/page/20054/experimental-work-questions" >Experimental work questions</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16324/the-examination-process" class="father">The examination process</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/16316/setting-the-exam-papers" >Setting the exam papers</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16317/predicted-grades" >Predicted grades</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16318/marking-the-papers" >Marking the papers</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16319/commenting-on-the-exams" >Commenting on the exams</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16320/grade-awarding" >Grade Awarding</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16321/enquiry-upon-results" >Enquiry upon results</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16322/chief-examiners-report" >Chief Examiner's report</a></li><li ><a href="https://www.thinkib.net/chemistry/page/16323/retaking-the-exam" >Retaking the exam</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/16325/faqs" >FAQs</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/3147/ib-core" >IB Core</a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/3149/learner-profile" >Learner Profile</a></li><li ><a href="https://www.thinkib.net/chemistry/page/21735/extended-essays-" class="father">Extended Essays </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/21736/overview-" >Overview </a></li><li ><a href="https://www.thinkib.net/chemistry/page/21780/responsibilities" >Responsibilities</a></li><li ><a href="https://www.thinkib.net/chemistry/page/21790/resources" >Resources</a></li><li ><a href="https://www.thinkib.net/chemistry/page/21800/research" >Research</a></li><li ><a href="https://www.thinkib.net/chemistry/page/21804/writing-the-essay" >Writing the essay</a></li><li ><a href="https://www.thinkib.net/chemistry/page/21810/assessment" >Assessment</a></li><li ><a href="https://www.thinkib.net/chemistry/page/22434/summary-of-advice-" >Summary of advice </a></li><li ><a href="https://www.thinkib.net/chemistry/page/25272/faqs-" >FAQs </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/307/theory-of-knowledge-tok" class="father">Theory of Knowledge (TOK)</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/41171/the-12-tok-concepts" >The 12 TOK concepts</a></li><li ><a href="https://www.thinkib.net/chemistry/page/3507/why-tok-chemistry" >Why TOK & Chemistry?</a></li><li ><a href="https://www.thinkib.net/chemistry/page/3505/a-modern-paradigm" >A modern paradigm</a></li></ul></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/17783/fast-track-to-tests-questions" >Fast track to tests & questions</a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/17784/sl-multiple-choice-tests-on-individual-topics" >SL Multiple choice tests on individual topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/24351/sl-multiple-choice-quizzes-on-sub-topics" >SL Multiple choice 'quizzes' on sub-topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/31519/sl-practice-paper-1-exams" >SL Practice Paper 1 exams</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17786/sl-questions-on-each-sub-topic" >SL Questions on each sub-topic</a></li><li ><a href="https://www.thinkib.net/chemistry/page/20431/sl-paper-3-section-a-questions" >SL Paper 3 Section A questions</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17792/sl-questions-on-the-options" >SL Questions on the options</a></li><li ><a href="https://www.thinkib.net/chemistry/page/24897/sl-quizzes-on-option-sub-topics-" >SL Quizzes on option sub-topics </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17785/hl-multiple-choice-tests-on-individual-topics" >HL Multiple choice tests on individual topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/24352/hl-multiple-choice-quizzes-on-sub-topics" >HL Multiple choice 'quizzes' on sub-topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/31520/hl-practice-paper-1-exams-" >HL Practice Paper 1 exams </a></li><li ><a href="https://www.thinkib.net/chemistry/page/17787/hl-questions-on-each-sub-topic-" >HL Questions on each sub-topic </a></li><li ><a href="https://www.thinkib.net/chemistry/page/20428/hl-paper-3-section-a-questions" >HL Paper 3 Section A questions</a></li><li ><a href="https://www.thinkib.net/chemistry/page/17793/hl-questions-on-the-options" >HL Questions on the options</a></li><li ><a href="https://www.thinkib.net/chemistry/page/24973/hl-quizzes-on-option-sub-topics" >HL Quizzes on option sub-topics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/41573/printable-versions-of-written-tasks-" >Printable versions of written tasks </a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/41465/complete-course-for-students-" >Complete course for students </a><ul class="level-1"><li ><a href="https://www.thinkib.net/chemistry/page/27988/full-coverage-of-each-topic-and-sub-topic" class="father">Full coverage of each topic and sub-topic</a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/27959/topic-1-stoichiometric-relationships" >Topic 1 : Stoichiometric relationships</a></li><li ><a href="https://www.thinkib.net/chemistry/page/27960/topics-2-12-atomic-structure" >Topics 2 & 12 : Atomic structure</a></li><li ><a href="https://www.thinkib.net/chemistry/page/27965/topics-3-13-periodicity" >Topics 3 & 13 : Periodicity</a></li><li ><a href="https://www.thinkib.net/chemistry/page/27971/topics-4-14-chemical-bonding-structure" >Topics 4 & 14 : Chemical bonding & structure</a></li><li ><a href="https://www.thinkib.net/chemistry/page/27987/topics-5-15-energeticsthermochemistry" >Topics 5 & 15 : Energetics/thermochemistry</a></li><li ><a href="https://www.thinkib.net/chemistry/page/27995/topics-6-16-chemical-kinetics" >Topics 6 & 16 : Chemical kinetics</a></li><li ><a href="https://www.thinkib.net/chemistry/page/28001/topics-7-17-equilibrium-" >Topics 7 & 17 : Equilibrium </a></li><li ><a href="https://www.thinkib.net/chemistry/page/28017/topics-8-18-acids-and-bases-" >Topics 8 & 18 : Acids and bases </a></li><li ><a href="https://www.thinkib.net/chemistry/page/28031/topics-9-19-redox-process" >Topics 9 & 19 : Redox process</a></li><li ><a href="https://www.thinkib.net/chemistry/page/28061/topics-10-20-organic-chemistry" >Topics 10 & 20 : Organic chemistry</a></li><li ><a href="https://www.thinkib.net/chemistry/page/28038/topics-11-21-measurement-data-processing-analysis" >Topics 11 & 21 : Measurement, data processing & analysis</a></li><li ><a href="https://www.thinkib.net/chemistry/page/28074/option-a-materials-" >Option A : Materials </a></li><li ><a href="https://www.thinkib.net/chemistry/page/28087/option-b-biochemistry" >Option B : Biochemistry</a></li><li ><a href="https://www.thinkib.net/chemistry/page/28098/option-c-energy-" >Option C : Energy </a></li><li ><a href="https://www.thinkib.net/chemistry/page/28109/option-d-medicinal-chemistry" >Option D : Medicinal chemistry</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/41553/practical-work-including-ia-group-4-project-" class="father">Practical work (including IA & Group 4 Project) </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/41528/internal-assessment" >Internal Assessment</a></li><li ><a href="https://www.thinkib.net/chemistry/page/41657/group-4-project" >Group 4 Project</a></li></ul></li><li ><a href="https://www.thinkib.net/chemistry/page/41387/approaches-to-learning-" class="father">Approaches to learning </a><ul class="level-2"><li ><a href="https://www.thinkib.net/chemistry/page/41380/thinking-skills" >Thinking skills</a></li><li ><a href="https://www.thinkib.net/chemistry/page/41383/communication-skills" >Communication 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<div id="main-column" class="span9"><h1>Subscriber comments<br><small>(Last 3 months)</small></h1><div class="msg"></div><div id="section-index-comments"><ul style="list-style: none; margin: 0;"><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">15 Dec</span><strong>Amy Flindt</strong><br /><a href="https://www.thinkib.net/chemistry/page/16816/3-13-periodicity-transition-metals-2-#comm-86215" target="_blank">3 & 13. Periodicity & transition metals (2) </a></small></div><div class="content">Thank you for the explanation. Interesting idea about the non-polar connection with not being a ligand. Thanks again for taking the time to explain this. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">14 Dec</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/17114/topics-4-14#comm-86183" target="_blank">Topics 4 & 14</a></small></div><div class="content">Hi Renuka, The carbon to oxygen bonding in the ethanoate ion CH3COO– is a good example of resonance. The bond order is 1.5 as the C=O and C–O bonds can be drawn as two resonance hybrids so the two bond lengths and strengths are equal. Alternatively...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">14 Dec</span><strong>Renuka Wijesekara</strong><br /><a href="https://www.thinkib.net/chemistry/page/17114/topics-4-14#comm-86180" target="_blank">Topics 4 & 14</a></small></div><div class="content">The question 5 in bonding test 2 SL is comparing the bond length between C and O in different molecules. According to the answer, the bond lengths between C and O in acetate ion are the same. Could you please explain it to me. Is the electrons...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">13 Dec</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/16328/topic-1#comm-86152" target="_blank">Topic 1</a></small></div><div class="content">Hello Renuka, Yes, it is wrong. Ba2+(aq) and NO3–(aq) do not react as they are spectator ions so do not change. The reaction is between Ag+(aq) and Cl–(aq) ions which combine to precipitate silver chloride (which can be written either as...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">13 Dec</span><strong>Renuka Wijesekara</strong><br /><a href="https://www.thinkib.net/chemistry/page/16328/topic-1#comm-86133" target="_blank">Topic 1</a></small></div><div class="content">Dear Prof, The second question " Particulate nature of matter and chemical change" is asking ionic equation. You wrote Cl- + Ag+ --- AgCl as the ionic equation for the reaction between barium chloride and silver nitrate.Is it wrong...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">13 Dec</span><strong>Renuka Wijesekara</strong><br /><a href="https://www.thinkib.net/chemistry/page/18350/topics-9-19#comm-86130" target="_blank">Topics 9 & 19</a></small></div><div class="content">Thank you Prof. Now I do understand her results. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">13 Dec</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/16816/3-13-periodicity-transition-metals-2-#comm-86102" target="_blank">3 & 13. Periodicity & transition metals (2) </a></small></div><div class="content">Hi Amy, Unlike ligands such as H2O and NH3 etc., SiCl4 does not contain a non-bonding pair of electrons around its central atom so does not act as a ligand. In fact, unlike CCl4, it can act as a Lewis acid rather than a Lewis base as it is...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">12 Dec</span><strong>Amy Flindt</strong><br /><a href="https://www.thinkib.net/chemistry/page/16816/3-13-periodicity-transition-metals-2-#comm-86085" target="_blank">3 & 13. Periodicity & transition metals (2) </a></small></div><div class="content">Hi Geoffrey,On number 15, can you please explain why SiCl4 dose not act as a ligand. Thanks! </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Dec</span><strong>jack otieno</strong><br /><a href="https://www.thinkib.net/chemistry/page/17286/11-measurement-data-processing-1-#comm-85888" target="_blank">11. Measurement & data processing (1) </a></small></div><div class="content">Thank you, Dr. Geoff.That was very elaborate. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Dec</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/17286/11-measurement-data-processing-1-#comm-85880" target="_blank">11. Measurement & data processing (1) </a></small></div><div class="content">Hi Jack,This is Qu. 29 in the November 2022 SL exam (and Qu. 39 on the HL paper). I don't think it is well worded as the question 'talks' about idea and prediction whereas all the answers 'talk' about theory and hypothesis which are not necessarily...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Dec</span><strong>jack otieno</strong><br /><a href="https://www.thinkib.net/chemistry/page/17286/11-measurement-data-processing-1-#comm-85847" target="_blank">11. Measurement & data processing (1) </a></small></div><div class="content">Hi Dr. Geoff,Could you help with this?A well tested scientific idea which has been used to make predictions cannot explain a particular event. Which statement describes the scientific approach to this dilemma?A. Hypothesis should be discardedB....</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">5 Dec</span><strong>Charmaine dela Cruz</strong><br /><a href="https://www.thinkib.net/chemistry/page/40902/covalent-bonding-questions#comm-85770" target="_blank">Covalent bonding questions</a></small></div><div class="content">Thank you, Geoff! :) I didn't think you would reply so fast. I appreciate it. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">5 Dec</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/40902/covalent-bonding-questions#comm-85769" target="_blank">Covalent bonding questions</a></small></div><div class="content">Hi Charmaine, Happy to help. It is Question 5 on Further aspects of covalent bonding questions. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">5 Dec</span><strong>Charmaine dela Cruz</strong><br /><a href="https://www.thinkib.net/chemistry/page/40902/covalent-bonding-questions#comm-85768" target="_blank">Covalent bonding questions</a></small></div><div class="content">Hi Geoff, I was hoping you could help me find a question, please. I've already searched it up on my own but I still can't find it and I'm quite sure I got the question from this site. Here's the question: "Ultraviolet light can break the oxygen-to-oxygen...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">28 Nov</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/24480/mc-test-covalent-structures-1#comm-85406" target="_blank">MC test: Covalent structures (1)</a></small></div><div class="content">Hi Austin, No, I don't think so. All four of each carbon atom's valence electrons are used in the bonding in graphite. Three of them form sigma bonds to three other carbon atoms and the fourth is delocalised forming weak attractions (i.e. a...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">28 Nov</span><strong>Austin Dwyer</strong><br /><a href="https://www.thinkib.net/chemistry/page/24480/mc-test-covalent-structures-1#comm-85399" target="_blank">MC test: Covalent structures (1)</a></small></div><div class="content">For question 6, could option (b) not also be possible? </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">17 Nov</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/18965/evaluation#comm-84925" target="_blank">Evaluation</a></small></div><div class="content">Hi Amy, One of the problems with the IA is that what examiners are told to look for seems to depend more upon what is written in the subject reports than what is written in the subject guide and has changed somewhat since this syllabus started...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">17 Nov</span><strong>Amy Flindt</strong><br /><a href="https://www.thinkib.net/chemistry/page/18965/evaluation#comm-84922" target="_blank">Evaluation</a></small></div><div class="content">Our IB Chemistry teachers are trying to get better at helping students with their evaluations. Do you have any additional resources on this site that explain what is on this page better (or suggestions on IB specific resources we could use)....</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">10 Nov</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/blog/36303/update-on-the-implementation-of-the-new-programme#comm-84457" target="_blank">Update on the implementation of the new programme</a></small></div><div class="content">Hi Renee, Although the IB has issued several releases about the new subject guide (e.g. see my blog) the new 2023 guide is not due for publication until early next year (probably February). Once it is in the public domain (i.e. on My IB) this...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">10 Nov</span><strong>Renee Coffey</strong><br /><a href="https://www.thinkib.net/chemistry/blog/36303/update-on-the-implementation-of-the-new-programme#comm-84447" target="_blank">Update on the implementation of the new programme</a></small></div><div class="content">Hi Mr Neuss- has the new syllabus's subject guide been published anywhere yet? Or are we still waiting until after new year? </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Nov</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/32111/hl-practice-paper-1-3-#comm-84261" target="_blank">HL Practice Paper 1 (3) </a></small></div><div class="content">Leo, The easiest thing to do is sign your students up to student access then you can set the exam as an assignment and their answers will be marked automatically and then transferred directly to your mark book The students will also be able...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Nov</span><strong>Leo Jiang</strong><br /><a href="https://www.thinkib.net/chemistry/page/32111/hl-practice-paper-1-3-#comm-84251" target="_blank">HL Practice Paper 1 (3) </a></small></div><div class="content">Hi. I am a chemistry teacher in Japan. Can anyone tell me how to download those papers as prinatble version? </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">31 Oct</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/16636/determining-ea-for-a-reaction#comm-83971" target="_blank">Determining <i>E</i><sub>a</sub> for a reaction</a></small></div><div class="content">Hi Dea,A plot of ln t against 1/T gives a straight line with the gradient = Ea/R (see teacher's notes above) so the activation energy = gradient multiplied by R (not divided by R). If the gradient = 5696.1, then...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">31 Oct</span><strong>Dea Sukrisna</strong><br /><a href="https://www.thinkib.net/chemistry/page/16636/determining-ea-for-a-reaction#comm-83964" target="_blank">Determining <i>E</i><sub>a</sub> for a reaction</a></small></div><div class="content">the gradient from Cleaps's data is 5696.1. Divided by R value becomes, 685.4 J. How come it is said that the result is 47kJ? </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">26 Oct</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/16640/voltaic-cells#comm-83760" target="_blank">Voltaic cells</a></small></div><div class="content">Hi Margarethe,I have not provided answer sheets for the questions on the practical worksheets as many of them involve students using data that they themselves have obtained (e.g. questions 2 and 3 above) so the answers will be different for...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">26 Oct</span><strong>Margarethe Streutker</strong><br /><a href="https://www.thinkib.net/chemistry/page/16640/voltaic-cells#comm-83757" target="_blank">Voltaic cells</a></small></div><div class="content">Hi, are there answer sheets available for these mandatory practicals? can not seem to find them </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">24 Oct</span><strong>Charmaine dela Cruz</strong><br /><a href="https://www.thinkib.net/chemistry/page/41573/printable-versions-of-written-tasks-#comm-83649" target="_blank">Printable versions of written tasks </a></small></div><div class="content">Thank you! :) Very useful. </div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">19 Oct</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/36257/how-to-navigate-the-site#comm-83457" target="_blank">How to navigate the site</a></small></div><div class="content">Hello Philip, If you look at the "syllabus outline" (p18-21) in the current guide you will see that these are recommended teaching hours. They add up to 110 hours for SL and 180 hours for HL with the remaining 40/60 hours for the Practical...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">18 Oct</span><strong>Philip Biggs</strong><br /><a href="https://www.thinkib.net/chemistry/page/36257/how-to-navigate-the-site#comm-83415" target="_blank">How to navigate the site</a></small></div><div class="content">Hi Geoffrey, where is gives suggested number of hours for each topic (e.g. Topics 8 ( 6.5 h) & 18 ( 10 h) : Acids and bases) in the Teachers view, are these hours spent teaching or hours spent learning ? (I am guessing that former, since...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">8 Oct</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/18350/topics-9-19#comm-83023" target="_blank">Topics 9 & 19</a></small></div><div class="content">Hello Renuka, Have you considered the fact that the Winkler method involves the formation of iodine from iodide ions and the more chlorine that is present the greater the formation of iodine? This will make it appear that the amount of dissolved...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Oct</span><strong>Renuka Wijesekara</strong><br /><a href="https://www.thinkib.net/chemistry/page/18350/topics-9-19#comm-83022" target="_blank">Topics 9 & 19</a></small></div><div class="content">Dear Prof Jeff,I am Renuka from Norway and attended to several workshops of yours in Berlyn. I am working in Blinder VGS in Norway. One of my students wanted to test "the effect of chlorine content on dissolve oxygen level in water". So...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Oct</span><strong>Geoffrey Neuss</strong><br /><a href="https://www.thinkib.net/chemistry/page/18957/analysis#comm-82993" target="_blank">Analysis</a></small></div><div class="content">Hello again Xiaodan,It is not very clearly expressed in the report which I suspect was written by a non-native speaker of English as there are several slightly strangely worded sentences and often a reference to how Spanish rather than English...</div></li><li style="margin: 5px 0; padding: 10px;"><div class="header"><small><span class="gray pull-right">7 Oct</span><strong>Xiaodan Wang</strong><br /><a href="https://www.thinkib.net/chemistry/page/18957/analysis#comm-82983" target="_blank">Analysis</a></small></div><div class="content">Hello Dr. Neuss,Thank you so much! It is reassuring to know that I am not the only one who is confused about the statement. On the second note, I would to have some help with checking my understanding on this section from the subject report,...</div></li></ul></div></div><!-- /#main-column -->
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