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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 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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 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trends</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40928/periodic-trends-questions-1.html" title="Periodic trends questions">Periodic trends questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17041/first-row-d-block-elements--1.html" title="First-row d-block elements ">First-row d-block elements </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24442/mc-test-first-row-d-block-elements-1.html" title="MC test: First-row d-block elements">MC test: First-row d-block elements</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40929/first-row-d-block-elements-questions-1.html" title="First row d-block elements questions">First row d-block elements questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander 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"><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24470/mc-test-ionic-bonding-structure-1.html" title="MC test: Ionic bonding & structure">MC test: Ionic bonding & structure</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40897/ionic-bonding-structure-questions-1.html" title="Ionic bonding & structure questions">Ionic bonding & structure questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../17110/data-response-question-1.html" title="Data response question">Data response question</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24177/data-response-answers-1.html" title="Data response answers">Data response answers</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17117/covalent-bonding-1.html" title="Covalent bonding">Covalent bonding</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24471/mc-test-covalent-bonding-1.html" title="MC test: Covalent bonding">MC test: Covalent bonding</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40902/covalent-bonding-questions-1.html" title="Covalent bonding questions">Covalent bonding questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17127/covalent-structures-1-1.html" title="Covalent structures (1)">Covalent structures (1)</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24480/mc-test-covalent-structures-1-1.html" title="MC test: Covalent structures (1)">MC test: Covalent structures (1)</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40919/covalent-structures-1-questions-1.html" title="Covalent structures (1) questions">Covalent structures (1) questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17122/covalent-structures-2-1.html" title="Covalent structures (2)">Covalent structures (2)</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24481/mc-test-covalent-structures-2--1.html" title="MC test: Covalent structures (2) ">MC test: Covalent structures (2) </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40918/covalent-structure-2-shapes-polarity-questions-1.html" title="Covalent structure (2) Shapes & polarity questions">Covalent structure (2) Shapes & polarity questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17160/intermolecular-forces-1.html" title="Intermolecular forces">Intermolecular forces</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24512/mc-test-intermolecular-forces-1.html" title="MC test: Intermolecular forces">MC test: Intermolecular forces</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40937/intermolecular-forces-questions-1.html" title="Intermolecular forces questions">Intermolecular forces questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17237/metallic-bonding-1.html" title="Metallic bonding">Metallic bonding</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24513/mc-test-metallic-bonding-1.html" title="MC test: Metallic bonding">MC test: Metallic bonding</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40939/metallic-bonding-questions-1.html" title="Metallic bonding questions">Metallic bonding questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17260/further-aspects-of-covalent-bonding--1.html" title="Further aspects of covalent bonding ">Further aspects of covalent bonding </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24553/mc-test-further-aspects-of-covalent-bonding-1.html" title="MC test: Further aspects of covalent bonding">MC test: Further aspects of covalent bonding</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40940/further-aspects-of-covalent-bonding-questions-1.html" title="Further aspects of covalent bonding questions">Further aspects of covalent bonding questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17258/hybridization-1.html" title="Hybridization">Hybridization</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24555/mc-test-hybridization-1.html" title="MC test: Hybridization">MC test: Hybridization</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40941/hybridization-questions-1.html" title="Hybridization questions">Hybridization questions</a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../17669/topics-5-15--1.html" title="Topics 5 & 15 ">Topics 5 & 15 </a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17685/measuring-energy-changes-1.html" title="Measuring energy changes">Measuring energy changes</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24581/mc-test-measuring-energy-changes-1.html" title="MC test: Measuring energy changes">MC test: Measuring energy changes</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39536/measuring-energy-changes-questions--1.html" title="Measuring energy changes questions ">Measuring energy changes questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17689/hesss-law--1.html" title="Hess's Law ">Hess's Law </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24582/mc-test-hesss-law-1.html" title="MC test: Hess's Law">MC test: Hess's Law</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39546/hesss-law-questions-1.html" title="Hess's Law questions">Hess's Law questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17774/bond-enthalpies-1.html" title="Bond enthalpies">Bond enthalpies</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24591/mc-test-bond-enthalpies-1.html" title="MC test: Bond enthalpies">MC test: Bond enthalpies</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39547/bond-enthalpy-questions--1.html" title="Bond enthalpy questions ">Bond enthalpy questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17776/energy-cycles--1.html" title="Energy cycles ">Energy cycles </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24593/mc-test-energy-cycles-1.html" title="MC test: Energy cycles">MC test: Energy cycles</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39569/energy-cycles-questions--1.html" title="Energy cycles questions ">Energy cycles questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17780/entropy-spontaneity--1.html" title="Entropy & spontaneity ">Entropy & spontaneity </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24608/mc-test-entropy-spontaneity-1.html" title="MC test: Entropy & spontaneity">MC test: Entropy & spontaneity</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39650/entropy-spontaneity-questions--1.html" title="Entropy & spontaneity questions ">Entropy & spontaneity questions </a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../17848/topics-6-16-1.html" title="Topics 6 & 16">Topics 6 & 16</a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17850/collision-theory-rates-of-reaction-1.html" title="Collision theory & rates of reaction">Collision theory & rates of reaction</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24640/mc-test-collision-theory-rates-of-reaction-1.html" title="MC test: Collision theory & rates of reaction">MC test: Collision theory & rates of reaction</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40946/collision-theory-questions-1.html" title="Collision theory questions">Collision theory questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40947/rates-of-reaction-questions-1.html" title="Rates of reaction questions">Rates of reaction questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17870/rate-expression-reaction-mechanism-1.html" title="Rate expression & reaction mechanism">Rate expression & reaction mechanism</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24645/mc-test-rate-expression-reaction-mechanisms-1.html" title="MC test: Rate expression & reaction mechanisms">MC test: Rate expression & reaction mechanisms</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40949/rate-expression-questions-1.html" title="Rate expression questions">Rate expression questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40950/reaction-mechanisms-questions-1.html" title="Reaction mechanisms questions">Reaction mechanisms questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17876/activation-energy-1.html" title="Activation energy">Activation energy</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24651/mc-test-activation-energy-1.html" title="MC test: Activation energy">MC test: Activation energy</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40954/activation-energy-questions-1.html" title="Activation energy questions">Activation energy questions</a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../18038/topics-7-17--1.html" title="Topics 7 & 17 ">Topics 7 & 17 </a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18040/equilibrium--1.html" title="Equilibrium ">Equilibrium </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24656/mc-test-equilibrium-1.html" title="MC test: Equilibrium">MC test: Equilibrium</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40959/equilibrium-questions-1.html" title="Equilibrium questions">Equilibrium questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18091/equilibrium-law--1.html" title="Equilibrium law ">Equilibrium law </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24660/mc-test-the-equilibrium-law-1.html" title="MC test: The equilibrium law">MC test: The equilibrium law</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40961/equilibrium-law-questions-1.html" title="Equilibrium law questions">Equilibrium law questions</a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../18120/topics-8-18--1.html" title="Topics 8 & 18 ">Topics 8 & 18 </a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18124/theories-of-acids-bases--1.html" title="Theories of acids & bases ">Theories of acids & bases </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24662/mc-test-theories-of-acids-bases-1.html" title="MC test: Theories of acids & bases">MC test: Theories of acids & bases</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40963/theories-of-acids-bases-questions-1.html" title="Theories of acids & bases questions">Theories of acids & bases questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18126/properties-of-acids-bases-1.html" title="Properties of acids & bases">Properties of acids & bases</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24663/mc-test-properties-of-acids-bases--1.html" title="MC test: Properties of acids & bases ">MC test: Properties of acids & bases </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40964/properties-of-acids-bases-questions-1.html" title="Properties of acids & bases questions">Properties of acids & bases questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18140/ph-scale-1.html" title="pH scale">pH scale</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24668/mc-test-the-ph-scale-1.html" title="MC test: The pH scale">MC test: The pH scale</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40971/ph-scale-questions-1.html" title="pH scale questions">pH scale questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18152/strong-weak-acids-bases-1.html" title="Strong & weak acids & bases">Strong & weak acids & bases</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24670/mc-test-strong-weak-acids-bases-1.html" title="MC test: Strong & weak acids & bases">MC test: Strong & weak acids & bases</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40972/strong-weak-acid-bases-questions-1.html" title="Strong & weak acid & bases questions">Strong & weak acid & bases questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18156/acid-deposition-1.html" title="Acid deposition">Acid deposition</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24674/mc-test-acid-deposition-1.html" title="MC test: Acid deposition">MC test: Acid deposition</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40983/acid-deposition-questions-1.html" title="Acid deposition questions">Acid deposition questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18160/lewis-acids-bases-1.html" title="Lewis acids & bases">Lewis acids & bases</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24710/mc-test-lewis-acids-bases-1.html" title="MC test: Lewis acids & bases">MC test: Lewis acids & bases</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40986/lewis-acids-bases-questions-1.html" title="Lewis acids & bases questions">Lewis acids & bases questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18250/acid-base-calculations-1.html" title="Acid base calculations">Acid base calculations</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24714/mc-test-calculations-involving-acids-bases--1.html" title="MC test: Calculations involving acids & bases ">MC test: Calculations involving acids & bases </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../40988/acid-base-calculations-questions--1.html" title="Acid-base calculations questions ">Acid-base calculations questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26161/ph-titration-curves-1.html" title="pH titration curves">pH titration curves</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../26158/mc-test-ph-curves-1.html" title="MC test: pH curves">MC test: pH curves</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41000/ph-curves-questions--1.html" title="pH curves questions ">pH curves questions </a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../18350/topics-9-19-1.html" title="Topics 9 & 19">Topics 9 & 19</a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18365/oxidation-reduction-1.html" title="Oxidation & reduction">Oxidation & reduction</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24725/mc-test-oxidation-reduction-1.html" title="MC test: Oxidation & reduction">MC test: Oxidation & reduction</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41033/oxidation-reduction-questions-1--1.html" title="Oxidation & reduction questions (1) ">Oxidation & reduction questions (1) </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41034/oxidation-reduction-questions-2-1.html" title="Oxidation & reduction questions (2)">Oxidation & reduction questions (2)</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41035/oxidation-reduction-questions-3-1.html" title="Oxidation & reduction questions (3)">Oxidation & reduction questions (3)</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18383/electrochemical-cells-1.html" title="Electrochemical cells">Electrochemical cells</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24740/mc-test-electrochemical-cells-1.html" title="MC test: Electrochemical cells">MC test: Electrochemical cells</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41072/electrochemical-cells-questions--1.html" title="Electrochemical cells questions ">Electrochemical cells questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18401/electrochemical-cells-ahl--1.html" title="Electrochemical cells (AHL) ">Electrochemical cells (AHL) </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24742/mc-test-electrochemical-cells-ahl-1.html" title="MC test: Electrochemical cells (AHL)">MC test: Electrochemical cells (AHL)</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41098/electrochemical-cells-1-ahl-questions-1.html" title="Electrochemical cells (1) (AHL) questions">Electrochemical cells (1) (AHL) questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41099/electrochemical-cells-2-ahl-questions-1.html" title="Electrochemical cells (2) (AHL) questions">Electrochemical cells (2) (AHL) questions</a></li></ul></ul><li class="ancestor parent" style="padding-left: 14px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a href="../18475/topics-10-20--1.html" title="Topics 10 & 20 ">Topics 10 & 20 </a></li><ul class="level-2 expanded"><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18497/fundamentals-of-organic-chemistry--1.html" title="Fundamentals of organic chemistry ">Fundamentals of organic chemistry </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24749/mc-test-fundamentals-of-organic-chemistry-1.html" title="MC test: Fundamentals of organic chemistry">MC test: Fundamentals of organic chemistry</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41111/fundamentals-of-organic-chemistry-1-questions-1.html" title="Fundamentals of organic chemistry (1) questions">Fundamentals of organic chemistry (1) questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41112/fundamentals-of-organic-chemistry-2-questions-1.html" title="Fundamentals of organic chemistry (2) questions">Fundamentals of organic chemistry (2) questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18597/alkanes-alkenes-addition-polymers-1.html" title="Alkanes, alkenes & addition polymers">Alkanes, alkenes & addition polymers</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24750/mc-test-alkanes-alkenes-addition-polymers-1.html" title="MC test: Alkanes, alkenes & addition polymers">MC test: Alkanes, alkenes & addition polymers</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41121/alkanes-questions-1.html" title="Alkanes questions">Alkanes questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41124/alkenes-questions-1.html" title="Alkenes questions">Alkenes questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18741/alcohols--1.html" title="Alcohols ">Alcohols </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24772/mc-test-alcohols-1.html" title="MC test: Alcohols">MC test: Alcohols</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41125/alcohols-questions-1.html" title="Alcohols questions">Alcohols questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18742/halogenoalkanes-benzene--1.html" title="Halogenoalkanes & benzene ">Halogenoalkanes & benzene </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24797/mc-test-halogenoalkanes-benzene-1.html" title="MC test: Halogenoalkanes & benzene">MC test: Halogenoalkanes & benzene</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41130/halogenoalkanes-benzene-questions-1.html" title="Halogenoalkanes & benzene questions">Halogenoalkanes & benzene questions</a></li></ul><li class="ancestor parent" style="padding-left: 28px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a href="../18762/nucleophilic-substitution--1.html" title="Nucleophilic substitution ">Nucleophilic substitution </a></li><ul class="level-3 expanded"><li class="current" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="mc-test-nucleophilic-substitution-1.html" title="MC test: Nucleophilic substitution">MC test: Nucleophilic substitution</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41138/nucleophilic-substitution-questions-1.html" title="Nucleophilic substitution questions">Nucleophilic substitution questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18766/electrophilic-addition--1.html" title="Electrophilic addition ">Electrophilic addition </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24805/mc-test-electrophilic-addition-electrophilic-substitution-reacti-2.html" title="MC test: Electrophilic addition & electrophilic substitution reactions">MC test: Electrophilic addition & electrophilic substitution reactions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41148/electrophilic-addition-questions-1.html" title="Electrophilic addition questions">Electrophilic addition questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18780/electrophilic-substitution--2.html" title="Electrophilic substitution ">Electrophilic substitution </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41149/electrophilic-substitution-questions-1.html" title="Electrophilic substitution questions">Electrophilic substitution questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18793/reduction-reactions--1.html" title="Reduction reactions ">Reduction reactions </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24811/mc-test-reduction-reactions-1.html" title="MC test: Reduction reactions">MC test: Reduction reactions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41150/reduction-reactions-questions-1.html" title="Reduction reactions questions">Reduction reactions questions</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18797/synthetic-routes--1.html" title="Synthetic routes ">Synthetic routes </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24822/mc-test-synthetic-routes-1.html" title="MC test: Synthetic routes">MC test: Synthetic routes</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41152/synthetic-routes-questions--1.html" title="Synthetic routes questions ">Synthetic routes questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18844/stereoisomerism--1.html" title="Stereoisomerism ">Stereoisomerism </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24817/mc-test-stereoisomerism-1.html" title="MC test: Stereoisomerism">MC test: Stereoisomerism</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../41166/stereoisomerism-questions-1.html" title="Stereoisomerism questions">Stereoisomerism questions</a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../17285/topics-11-21--1.html" title="Topics 11 & 21 ">Topics 11 & 21 </a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17276/uncertainty-errors--1.html" title="Uncertainty & errors ">Uncertainty & errors </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24818/mc-test-uncertainties-errors-1.html" title="MC test: Uncertainties & errors">MC test: Uncertainties & errors</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../38869/uncertainty-error-questions--1.html" title="Uncertainty & error questions ">Uncertainty & error questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../15014/graphical-techniques-1.html" title="Graphical techniques">Graphical techniques</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24819/mc-test-graphical-techniques-1.html" title="MC test: Graphical techniques">MC test: Graphical techniques</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39387/graphical-techniques-questions--1.html" title="Graphical techniques questions ">Graphical techniques questions </a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18968/spectroscopic-identification-of-organic-compounds-1.html" title="Spectroscopic identification of organic compounds">Spectroscopic identification of organic compounds</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24820/mc-test-spectroscopic-identification-of-organic-compounds--1.html" title="MC test: Spectroscopic identification of organic compounds ">MC test: Spectroscopic identification of organic compounds </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39388/index-of-hydrogen-deficiency-questions-1.html" title="Index of hydrogen deficiency questions">Index of hydrogen deficiency questions</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39351/identification-from-spectra-question-1-1.html" title="Identification from spectra - Question 1">Identification from spectra - Question 1</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39353/identification-from-spectra-question-2-1.html" title="Identification from spectra - Question 2">Identification from spectra - Question 2</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39354/identification-from-spectra-question-3-1.html" title="Identification from spectra - Question 3">Identification from spectra - Question 3</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39355/identification-from-spectra-question-4-1.html" title="Identification from spectra - Question 4">Identification from spectra - Question 4</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39356/identification-from-spectra-question-5-1.html" title="Identification from spectra - Question 5">Identification from spectra - Question 5</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39357/identification-from-spectra-question-6-1.html" title="Identification from spectra - Question 6">Identification from spectra - Question 6</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39358/identification-from-spectra-question-7-1.html" title="Identification from spectra - Question 7">Identification from spectra - Question 7</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39359/identification-from-spectra-question-8-1.html" title="Identification from spectra - Question 8">Identification from spectra - Question 8</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39360/identification-from-spectra-question-9-1.html" title="Identification from spectra - Question 9">Identification from spectra - Question 9</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39361/identification-from-spectra-question-10-1.html" title="Identification from spectra - Question 10">Identification from spectra - Question 10</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19027/spectroscopic-identification-of-organic-compounds-ahl--1.html" title="Spectroscopic identification of organic compounds (AHL) ">Spectroscopic identification of organic compounds (AHL) </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24821/mc-test-spectroscopic-identification-of-organic-compounds-ahl-1.html" title="MC test: Spectroscopic identification of organic compounds (AHL)">MC test: Spectroscopic identification of organic compounds (AHL)</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39375/identification-from-spectra-question-11-1.html" title="Identification from spectra - Question 11">Identification from spectra - Question 11</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39376/identification-from-spectra-question-12-1.html" title="Identification from spectra - Question 12">Identification from spectra - Question 12</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39377/identification-from-spectra-question-13-1.html" title="Identification from spectra - Question 13">Identification from spectra - Question 13</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39378/identification-from-spectra-question-14-1.html" title="Identification from spectra - Question 14">Identification from spectra - Question 14</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39379/identification-from-spectra-question-15-1.html" title="Identification from spectra - Question 15">Identification from spectra - Question 15</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39380/identification-from-spectra-question-16-1.html" title="Identification from spectra - Question 16">Identification from spectra - Question 16</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39381/identification-from-spectra-question-17-1.html" title="Identification from spectra - Question 17">Identification from spectra - Question 17</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39382/identification-from-spectra-question-18-1.html" title="Identification from spectra - Question 18">Identification from spectra - Question 18</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39383/identification-from-spectra-question-19-1.html" title="Identification from spectra - Question 19">Identification from spectra - Question 19</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../39385/identification-from-spectra-question-20-1.html" title="Identification from spectra - Question 20">Identification from spectra - Question 20</a></li></ul></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../16441/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="../16450/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="../34566/nos-critical-thinking-1.html" title="NOS & Critical Thinking">NOS & Critical Thinking</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../32100/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="../36753/the-culture-of-chemistry-1.html" title="The Culture of Chemistry">The Culture of Chemistry</a></li><li class="" style="padding-left: 14px"><i class="expander 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</div><section id="main-content"><h1><img alt="" height="22" src="../../../img/tib-icons/higher-level-32-1.png" title="" width="22"> Multiple choice test on 20.1(1) Nucleophilic substitution</h1>
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<p>Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).</p>
<p>If you get an answer wrong, read through the explanation carefully to learn from your mistakes.</p>
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<div class="tib-quiz" data-quiz-id="371" data-structure="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" data-score-answers="6d4a526a457a48584f763758344a7649472f76324c53614b78524c393439595570496d5a5971374b38686f3d"><div class="exercise">
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<p>What does a 'curly arrow' represent when used in organic reaction mechanisms?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="e2279d2cb7ad9e59d0b8567b178f7573"><input type="radio"><span> the formation of products in a reaction</span></label><!--[endif]----></p>
<p><label class="radio" data-answer="f1d01ed234d1b4592c731d969599bf31"><input type="radio"><span> the movement of an electron pair</span></label></p>
<p><label class="radio" data-answer="e3907bdd4186593fb688768b6ee403b2"><input type="radio"><span> the movement of an electron</span></label></p>
<p><label class="radio" data-answer="32d5f82e25ffd5e919400d66ed1f6825"><input type="radio"><span> the movement of a proton</span></label></p>
</div>
<div class="q-explanation">
<p>Curly arrows are used to show the movement of pairs of electrons in organic reaction mechanisms. They start at the origin of a pair of electrons and the 'head of the arrow' shows where they end up.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which alcohol can be formed directly from a halogenoalkane that has predominantly reacted with warm aqueous sodium hydroxide via the S<sub>N</sub>1 mechanism?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="0a26ea9d2e70ddf10231659a3802347b"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/primary.png" style="width: 120px; height: 60px;"></span></label></p>
<p><label class="radio" data-answer="a2695d611868fd277fdf8587db9f96e9"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/tertiary.png" style="width: 120px; height: 74px;"></span></label></p>
<p><label class="radio" data-answer="cd34da78916493ec39635b5119e5b4dd"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/3-methylbutan-3-ol.png" style="width: 90px; height: 62px;"></span></label></p>
<p><label class="radio" data-answer="f4e2776afffd75ebaa9e29e5abc4ef81"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/butan-2-ol.png" style="width: 120px; height: 58px;"></span></label></p>
</div>
<div class="q-explanation">
<p>Tertiary halogenoalkanes react with hydroxide ions by the S<sub>N</sub>1 mechanism to form tertiary alcohols. The only tertiary alcohol in the list is 2-methylpropan-2-ol.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which factors explain why tertiary halogenoalkanes tend to react via the S<sub>N</sub>1 mechanism rather than via the S<sub>N</sub>2 mechanism?</p>
<p><strong>I. </strong>Steric hindrance - there is less room around the central carbon atom in tertiary halogenoalkanes to form a transition state involving five entities bonded to the carbon atom.</p>
<p><strong>II. </strong>Homolytic fission - the C−halogen bond in tertiary halogenoalkanes undergoes homolytic fission more readily than in primary halogenoalkanes.</p>
<p><strong>III. </strong>Positive inductive effect - the R− groups tend to 'push' electrons towards the central carbon atom which helps to stabilise the carbocation when it is formed.</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="fb11b627e4760b5e2524a7af2daae6e8"><input type="radio"><span> <strong>I</strong> and <strong>III</strong> only</span></label></p>
<p><label class="radio" data-answer="f66d74473eaa9d67d77a484a14d7ffce"><input type="radio"><span> <strong>I</strong> and <strong>II</strong> only</span></label></p>
<p><label class="radio" data-answer="6e8f59490da4f8511cc6c35874c9aea1"><input type="radio"><span> <strong>II</strong> and <strong>III</strong> only</span></label></p>
<p><label class="radio" data-answer="e6419af0165dac3130ce54bcb3f615f5"><input type="radio"><span> <strong>I</strong>, <strong>II </strong>and <strong>III</strong></span></label></p>
</div>
<div class="q-explanation">
<p>The first step (the rate determining step) in the S<sub>N</sub>1 mechanism is the <strong>heterolytic</strong> breaking of the C−halogen bond.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which is the main reason why iodooalkanes are more readily substituted by nucleophiles than chloroalkanes?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="31d82e8cba870a31f06196ffcca092b7"><input type="radio"><span> The electron affinity of chlorine is greater than the electron affinity of iodine.</span></label></p>
<p><label class="radio" data-answer="7ddabe9969fa6d51b3583986af2f2c2d"><input type="radio"><span> The C−I bond enthalpy is smaller than the C−Cl bond enthalpy.</span></label></p>
<p><label class="radio" data-answer="1c45e909792ea3386e3b0de93a81715c"><input type="radio"><span> The atomic radius of a chlorine atom is smaller than the atomic radius of an iodine atom.</span></label></p>
<p><label class="radio" data-answer="75a8f39907f4b3a8dd3d1c2dfacbc8ce"><input type="radio"><span> Chlorine is more electronegative than iodine.</span></label></p>
</div>
<div class="q-explanation">
<p>The C−I bond enthalpy (228 kJ mol<sup>−1</sup>) is considerably less than the C−Cl bond enthalpy (324 kJ mol<sup>−1</sup>) so the activation energy will be lower for iodoalkanes.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which can be used as an aprotic polar solvent?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="97274c6cd502bd438497b5fb8e2dea3d"><input type="radio"><span> water, H<sub>2</sub>O</span></label></p>
<p><label class="radio" data-answer="4858e19850eccb433ea28f9641276bb8"><input type="radio"><span> ethanol, C<sub>2</sub>H<sub>5</sub>OH</span></label></p>
<p><label class="radio" data-answer="eb18ddb0f9daea5a3de198a69ebf2654"><input type="radio"><span> hexane, C<sub>6</sub>H<sub>14</sub></span></label></p>
<p><label class="radio" data-answer="0cb83fc1799416183fb89ef795908420"><input type="radio"><span> propanone, CH<sub>3</sub>COCH<sub>3</sub></span></label></p>
</div>
<div class="q-explanation">
<p>Protic solvents contain an hydrogen atom bonded directly to an oxygen or nitrogen atom. Aprotic solvents are polar but do not have an hydrogen atom bonded directly to an oxygen or nitrogen atom. Hexane is a non-polar solvent. </p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which row gives all the correct information concerning the reaction between 1-bromopropane and warm aqueous sodium hydroxide?</p>
<p><img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/reaction-of-1-bromobutane--with-naoh(1).png" style="width: 500px; height: 85px;"></p>
<table border="0" cellpadding="5" cellspacing="5" height="151" width="443">
<tbody>
<tr>
<td style="text-align: center;"><strong>Row</strong></td>
<td style="text-align: center;"><strong>Mechanism</strong></td>
<td style="text-align: center;"><strong>Rate equation</strong></td>
</tr>
<tr>
<td style="text-align: center;">1</td>
<td style="text-align: center;">S<sub>N</sub>1</td>
<td style="text-align: center;">rate = <em>k</em>[C<sub>3</sub>H<sub>7</sub>Br][OH<sup>−</sup>]</td>
</tr>
<tr>
<td style="text-align: center;">2</td>
<td style="text-align: center;">S<sub>N</sub>1</td>
<td style="text-align: center;">rate = <em>k</em>[C<sub>3</sub>H<sub>7</sub>Br]</td>
</tr>
<tr>
<td style="text-align: center;">3</td>
<td style="text-align: center;">S<sub>N</sub>2</td>
<td style="text-align: center;">rate = <em>k</em>[C<sub>3</sub>H<sub>7</sub>Br][OH<sup>−</sup>]</td>
</tr>
<tr>
<td style="text-align: center;">4</td>
<td style="text-align: center;">S<sub>N</sub>2</td>
<td style="text-align: center;">rate = <em>k</em>[C<sub>3</sub>H<sub>7</sub>Br]</td>
</tr>
</tbody>
</table>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="a87ff679a2f3e71d9181a67b7542122c"><input type="radio"><span> 4</span></label></p>
<p><label class="radio" data-answer="c81e728d9d4c2f636f067f89cc14862c"><input type="radio"><span> 2</span></label></p>
<p><label class="radio" data-answer="eccbc87e4b5ce2fe28308fd9f2a7baf3"><input type="radio"><span> 3</span></label></p>
<p><label class="radio" data-answer="c4ca4238a0b923820dcc509a6f75849b"><input type="radio"><span> 1</span></label></p>
</div>
<div class="q-explanation">
<p>It is a primary halogenoalkane so the mechanism is S<sub>N</sub>2 and the rate depends upon the concentration of both the halogenoalkane and the hydroxide ion as both are involved in the rate determining step.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which is the transition state in the reaction between bromoethane and warm dilute sodium hydroxide solution?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="8d831e99fc02f98fb71c23521ee98f04"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/transition-state(x).png" style="width: 100px; height: 75px;"></span></label></p>
<p><label class="radio" data-answer="49a3796aee804fafb045a3d9dc6d06ac"><input type="radio"><span> CH<sub>3</sub>CH<sub>2</sub><sup>+</sup></span></label></p>
<p><label class="radio" data-answer="2f18dfbb4b4d62192b3c23ab7cc3ec33"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/transition-state(y).png" style="width: 100px; height: 75px;"></span></label></p>
<p><label class="radio" data-answer="7102728f0a3a04a0f766e0206ff09fa4"><input type="radio"><span> <img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/organic-images/transition-state.png" style="width: 100px; height: 75px;"></span></label></p>
</div>
<div class="q-explanation">
<p>The transition state has five entities around the central carbon atom and, as it is formed by the OH<sup>−</sup> beginning to bond with the carbon atom before the C−Br bond has broken, it will have a delocalized negative charge.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which statements provides evidence that some secondary halogenoalkanes can undergo nucleophilic substitution by an S<sub>N</sub>2 mechanism?</p>
<p><strong>I. </strong>The organic product rotates plane-polarized light in the opposite direction to the organic reactant.</p>
<p><strong>II.</strong> The experimental rate equation shows that the reaction is first order with respect to hydroxide ions.</p>
<p><strong>III. </strong>The reaction works best using a protic solvent rather than an aprotic solvent.</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="e6419af0165dac3130ce54bcb3f615f5"><input type="radio"><span> <strong>I</strong>, <strong>II</strong> and <strong>III</strong></span></label></p>
<p><label class="radio" data-answer="f66d74473eaa9d67d77a484a14d7ffce"><input type="radio"><span> <strong>I </strong>and <strong>II</strong> only</span></label></p>
<p><label class="radio" data-answer="6e8f59490da4f8511cc6c35874c9aea1"><input type="radio"><span> <strong>II</strong> and <strong>III</strong> only</span></label></p>
<p><label class="radio" data-answer="fb11b627e4760b5e2524a7af2daae6e8"><input type="radio"><span> <strong>I</strong> and <strong>III </strong>only</span></label></p>
</div>
<div class="q-explanation">
<p>When the two R− groups are different, the secondary halogenoalkane will be optically active as it contains an asymmetric carbon atom. If one of the enantiomers is reacted, the OH<sup>−</sup> 'attacks' the carbon atom on the opposite side to the C−Br bond so the product is inverted and will rotate plane-polarized light in the opposite direction. Protic solvents favour the S<sub>N</sub>1 mechanism not the S<sub>N</sub>2 mechanism.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which statements are correct about the rate determining step in the S<sub>N</sub>1 mechanism?</p>
<p><strong>I. </strong>The molecularity of the reaction is 1.</p>
<p><strong>II.</strong> It is affected by the nature of the nucleophile.</p>
<p><strong>III.</strong> It involves the formation of a carbocation.</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="e6419af0165dac3130ce54bcb3f615f5"><input type="radio"><span> <strong>I</strong>, <strong>II</strong> and <strong>III</strong></span></label></p>
<p><label class="radio" data-answer="fb11b627e4760b5e2524a7af2daae6e8"><input type="radio"><span> <strong>I</strong> and<strong> III</strong> only</span></label></p>
<p><label class="radio" data-answer="f66d74473eaa9d67d77a484a14d7ffce"><input type="radio"><span> <strong>I</strong> and <strong>II</strong> only</span></label></p>
<p><label class="radio" data-answer="6e8f59490da4f8511cc6c35874c9aea1"><input type="radio"><span> <strong>II</strong> and <strong>III </strong>only</span></label></p>
</div>
<div class="q-explanation">
<p>The rate determining step for S<sub>N</sub>1 is R<sub>3</sub>C−X → R<sub>3</sub>C+ + X<sup>−</sup> (where R is an alkyl group and X is a halogen). The rate equation is rate = <em>k</em>[R<sub>3</sub>C−X] and the step is unimolecular. Since the concentration of the nucleophile is not involved in the rate equation the nature and concentration of the nucleophile does not affect it.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which factors explain why bromobenzene does not undergo nucleophilic substitution with warm dilute sodium hydroxide solution.</p>
<p><strong>I. </strong>Too much energy is required to overcome the delocalization energy of the aromatic ring.</p>
<p><strong>II.</strong> The nucleophile will be repelled by the electrons in the delocalized π bond above and below the benzene ring.</p>
<p><strong>III. </strong>The delocalization can extend to two more p electrons from a non-bonding orbital on the bromine atom making the C−Br bond stronger and so harder to break.</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="6e8f59490da4f8511cc6c35874c9aea1"><input type="radio"><span> <strong>II</strong> and <strong>III</strong> only</span></label></p>
<p><label class="radio" data-answer="fb11b627e4760b5e2524a7af2daae6e8"><input type="radio"><span> <strong>I</strong> and <strong>III</strong> only</span></label></p>
<p><label class="radio" data-answer="e6419af0165dac3130ce54bcb3f615f5"><input type="radio"><span> <strong>I</strong>, <strong>II</strong> and <strong>III</strong></span></label></p>
<p><label class="radio" data-answer="f66d74473eaa9d67d77a484a14d7ffce"><input type="radio"><span> <strong>I </strong>and <strong>II</strong> only</span></label></p>
</div>
<div class="q-explanation">
<p>Since the reaction involves substitution, not addition, the delocalization energy of the aromatic ring does not have to be overcome.</p>
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