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href="../19290/introduction-to-biochemistry--1.html">Introduction to biochemistry </a></li><li><a href="../19287/proteins-enzymes--1.html">Proteins & enzymes </a></li><li><a href="../19291/lipids-1.html">Lipids</a></li><li><a href="../19299/carbohydrates--1.html">Carbohydrates </a></li><li><a href="../19305/vitamins--1.html">Vitamins </a></li><li><a href="../19313/biochemistry-the-environment--1.html">Biochemistry & the environment </a></li><li><a href="../19336/proteins-enzymes-ahl--1.html">Proteins & enzymes (AHL) </a></li><li><a href="../19347/nucleic-acids--1.html">Nucleic acids </a></li><li><a href="../19361/biological-pigments--1.html">Biological pigments </a></li><li><a href="../19366/stereochemistry-in-biomolecules-1.html">Stereochemistry in biomolecules</a></li></ul></li><li><a href="../19390/option-c--1.html" class="father">Option C </a><ul class="level-2"><li><a href="../19391/energy-sources-1.html">Energy sources</a></li><li><a href="../19407/fossil-fuels-1.html">Fossil fuels</a></li><li><a href="../19411/nuclear-fusion-nuclear-fission-reactions-1.html">Nuclear fusion & nuclear fission reactions</a></li><li><a href="../19429/solar-energy-1.html">Solar energy</a></li><li><a href="../19437/environmental-impact-global-warming-1.html">Environmental impact - global warming</a></li><li><a href="../19453/electrochemistry-rechargeable-batteries-fuel-cells-1.html">Electrochemistry, rechargeable batteries & fuel cells</a></li><li><a href="../19458/nuclear-fusion-fission-hl--1.html">Nuclear fusion & fission (HL) </a></li><li><a href="../19470/photovoltaic-cells-and-dsscs-1.html">Photovoltaic cells and DSSCs</a></li></ul></li><li><a href="../19078/option-d-1.html" class="father">Option D</a><ul class="level-2"><li><a href="../19079/pharmaceutical-products-drug-action--1.html">Pharmaceutical products & drug action </a></li><li><a href="../19158/aspirin-penicillin--1.html">Aspirin & penicillin </a></li><li><a href="../19174/opiates-1.html">Opiates</a></li><li><a href="../19184/ph-regulation-of-the-stomach-1.html">pH regulation of the stomach</a></li><li><a href="../19194/antiviral-medications--1.html">Antiviral medications </a></li><li><a href="../19211/environmental-impact-of-some-medications-1.html">Environmental impact of some medications</a></li><li><a href="../19254/taxol-a-chiral-auxiliary-case-study-1.html">Taxol - a chiral auxiliary case study</a></li><li><a href="../19258/nuclear-medicine--1.html">Nuclear medicine </a></li><li><a href="../19273/drug-detection-analysis--1.html">Drug detection & analysis </a></li></ul></li></ul></li><li><a href="../16592/practical-scheme-of-work-ia--1.html">Practical scheme of work & IA </a><ul class="level-1"><li><a href="../16682/internal-assessment-1.html" class="father">Internal Assessment</a><ul class="level-2"><li><a href="../18892/scaffolding-the-investigation-1.html">'Scaffolding' the investigation</a></li><li><a href="../18896/timing-organisation--1.html">Timing & organisation </a></li><li><a href="../18905/choosing-the-research-question-1.html">Choosing the research question</a></li><li><a href="../18946/personal-engagement-1.html">Personal engagement</a></li><li><a href="../18950/exploration-1.html">Exploration</a></li><li><a href="../18957/analysis-1.html">Analysis</a></li><li><a href="../18965/evaluation-1.html">Evaluation</a></li><li><a href="../18966/communication-1.html">Communication</a></li><li><a href="../19882/internal-standardization-of-the-ia-1.html">Internal standardization of the IA</a></li><li><a href="../19901/submitting-the-samples-for-moderation-2.html">Submitting the samples for moderation</a></li><li><a href="../33754/ten-suggestions-for-ias-using-secondary-data-1.html">Ten suggestions for IAs using secondary data</a></li><li><a href="../37544/gaining-full-marks-for-a-databased-ia--1.html">Gaining full marks for a databased IA </a></li><li><a href="../19506/ia-example-marking-exercise--1.html">IA example & marking exercise </a></li><li><a href="../23929/genuine-examples-of-moderated-ia-reports-1.html">Genuine examples of moderated IA reports</a></li><li><a href="../25234/examples-of-teacher-marked-ia-reports--1.html">Examples of teacher-marked IA reports </a></li><li><a href="../37542/history-of-internal-assessment-1.html">History of Internal Assessment</a></li></ul></li><li><a href="../16598/mandatory-laboratory-components-1.html" class="father">Mandatory laboratory components</a><ul class="level-2"><li><a href="../16613/formula-of-magnesium-oxide--1.html">Formula of magnesium oxide </a></li><li><a href="../16612/determining-the-mr-of-an-unknown-gas-1.html">Determining the <i>M</i><sub>r</sub> of an unknown gas</a></li><li><a href="../16615/acid-base-titrations--1.html">Acid-base titrations </a></li><li><a href="../16616/a-green-acid-base-practical-1.html">A green acid-base practical</a></li><li><a href="../16617/analysis-of-aspirin-tablets-1.html">Analysis of aspirin tablets</a></li><li><a href="../16618/caco3-in-egg-shells-1.html">CaCO<sub>3</sub> in egg shells</a></li><li><a href="../16644/enthalpy-changes-1.html">Enthalpy changes</a></li><li><a href="../16631/reaction-rates-1.html">Reaction rates</a></li><li><a href="../16635/rate-dependent-factors-1.html">Rate-dependent factors</a></li><li><a href="../16636/determining-ea-for-a-reaction-1.html">Determining <i>E</i><sub>a</sub> for a reaction</a></li><li><a href="../16637/iodination-of-propanone-1.html">Iodination of propanone</a></li><li><a href="../18144/titrations-with-a-ph-meter-1.html">Titrations with a pH meter</a></li><li><a href="../18355/redox-titration-with-kmno4--1.html">Redox titration with KMnO<sub>4</sub> </a></li><li><a href="../16640/voltaic-cells-1.html">Voltaic cells</a></li><li><a href="../16659/3-d-molecular-modelling--1.html">3-D molecular modelling </a></li></ul></li><li><a href="../17168/other-good-practicals-1.html" class="father">Other good practicals</a><ul class="level-2"><li><a href="../17196/common-chemical-reactions-1.html">Common chemical reactions</a></li><li><a href="../227/elements-oxides-of-the-third-period--1.html">Elements & oxides of the third period </a></li><li><a href="../17239/the-halogens-1.html">The halogens</a></li><li><a href="../17162/boiling-points-of-mixtures-1.html">Boiling points of mixtures</a></li><li><a href="../17170/polarity-of-molecules-1.html">Polarity of molecules</a></li><li><a href="../18083/le-chateliers-principle--1.html">Le Chatelier's principle </a></li><li><a href="../19582/determining-kc-for-an-esterification-reaction-1.html">Determining <i>K</i><sub>c</sub> for an esterification reaction</a></li><li><a href="../18164/redox-reactions-of-vanadium--1.html">Redox reactions of vanadium </a></li><li><a href="../18351/chlorine-in-swimming-pools--1.html">Chlorine in swimming pools </a></li><li><a href="../18178/analysis-of-cuii-ions-in-solution--1.html">Analysis of Cu(II) ions in solution </a></li><li><a href="../18179/percentage-of-copper-in-brass-1.html">Percentage of copper in brass</a></li><li><a href="../18356/electrolytic-cells--1.html">Electrolytic cells </a></li><li><a href="../18598/reactions-of-organic-compounds-1.html">Reactions of organic compounds</a></li><li><a href="../18752/hydrolysis-of-halogenoalkanes-1.html">Hydrolysis of halogenoalkanes</a></li><li><a href="../18784/preparation-of-13-dinitrobenzene--1.html">Preparation of 1,3-dinitrobenzene </a></li><li><a href="../19022/determination-of-an-organic-structure-1.html">Determination of an organic structure</a></li><li><a href="../19887/preparation-of-nylon-66-1.html">Preparation of nylon 6,6</a></li><li><a href="../19343/determination-of-vitamin-c-content--1.html">Determination of vitamin C content </a></li><li><a href="../19342/hydrolysis-of-starch--1.html">Hydrolysis of starch </a></li><li><a href="../19159/preparation-purification-of-aspirin--1.html">Preparation & purification of aspirin </a></li></ul></li><li><a href="../18851/ict-in-practical-work-1.html" class="father">ICT in practical work</a><ul class="level-2"><li><a href="../18852/data-logging--1.html">Data logging </a></li><li><a href="../18853/software-for-graph-plotting--1.html">Software for graph plotting </a></li><li><a href="../18854/spreadsheets-for-data-processing--1.html">Spreadsheets for data processing </a></li><li><a href="../18855/databases-1.html">Databases</a></li><li><a href="../18856/computer-modelling-simulations--1.html">Computer modelling & simulations </a></li></ul></li><li><a href="../16594/group-4-project-1.html" class="father">Group 4 Project</a><ul class="level-2"><li><a href="../16595/practicalities-1.html">Practicalities</a></li><li><a href="../16596/reflective-statement--2.html">Reflective statement </a></li></ul></li><li><a href="../16666/a-new-laboratory-1.html">A new laboratory?</a></li></ul></li><li><a href="../16284/exams-1.html">Exams</a><ul class="level-1"><li><a href="../16286/essential-facts-1.html" class="father">Essential Facts</a><ul class="level-2"><li><a href="../16287/objectives-command-terms-1.html">Objectives & command terms</a></li><li><a href="../16288/grade-descriptors-1.html">Grade descriptors</a></li><li><a href="../16289/grade-boundaries-1.html">Grade boundaries</a></li></ul></li><li><a href="../16302/paper-1-multiple-choice-1.html" class="father">Paper 1 (Multiple Choice)</a><ul class="level-2"><li><a href="../16303/advice-to-students-paper-1-1.html">Advice to students (Paper 1)</a></li><li><a href="../31515/practice-paper-1-exams-1.html">Practice Paper 1 exams</a></li></ul></li><li><a href="../16305/paper-2-1.html" class="father">Paper 2</a><ul class="level-2"><li><a href="../16306/advice-to-students-paper-2-1.html">Advice to students (Paper 2)</a></li><li><a href="../16307/areas-of-difficulty-1.html">Areas of difficulty</a></li></ul></li><li><a href="../16313/paper-3--1.html" class="father">Paper 3 </a><ul class="level-2"><li><a 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options</a></li><li><a href="../24897/sl-quizzes-on-option-sub-topics--1.html">SL Quizzes on option sub-topics </a></li><li><a href="../17785/hl-multiple-choice-tests-on-individual-topics-1.html">HL Multiple choice tests on individual topics</a></li><li><a href="../24352/hl-multiple-choice-quizzes-on-sub-topics-1.html">HL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31520/hl-practice-paper-1-exams--1.html">HL Practice Paper 1 exams </a></li><li><a href="../17787/hl-questions-on-each-sub-topic--1.html">HL Questions on each sub-topic </a></li><li><a href="../20428/hl-paper-3-section-a-questions-1.html">HL Paper 3 Section A questions</a></li><li><a href="../17793/hl-questions-on-the-options-1.html">HL Questions on the options</a></li><li><a href="../24973/hl-quizzes-on-option-sub-topics-1.html">HL Quizzes on option sub-topics</a></li><li><a href="../41573/printable-versions-of-written-tasks--1.html">Printable versions of written tasks </a></li></ul></li><li><a 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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 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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=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../18475/topics-10-20--1.html" title="Topics 10 & 20 ">Topics 10 & 20 </a></li><ul class="level-2 "><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=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../18762/nucleophilic-substitution--1.html" title="Nucleophilic substitution ">Nucleophilic substitution </a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a href="../24757/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="" 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Acids and bases</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17416/9-redox-processes-1.html" title="9. Redox processes">9. Redox processes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17411/10-organic-chemistry-1--1.html" title="10. Organic chemistry (1) ">10. Organic chemistry (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17412/10-organic-chemistry-2--1.html" title="10. Organic chemistry (2) ">10. Organic chemistry (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17286/11-measurement-data-processing-1--1.html" title="11. Measurement & data processing (1) ">11. Measurement & data processing (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17287/11-measurement-data-processing-2-1.html" title="11. Measurement & data processing (2)">11. Measurement & data processing (2)</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../16688/hl-questions-by-topic-1.html" title="HL Questions by topic">HL Questions by topic</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16709/1-stoichiometric-relationships-1-1.html" title="1. Stoichiometric relationships (1)">1. Stoichiometric relationships (1)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16735/1-stoichiometric-relationships-2-1.html" title="1. Stoichiometric relationships (2)">1. Stoichiometric relationships (2)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../37016/2-12-atomic-structure-1-1.html" title="2 &12. Atomic structure (1)">2 &12. Atomic structure (1)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16721/2-12-atomic-structure-2-1.html" title="2 &12. Atomic structure (2)">2 &12. Atomic structure (2)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16815/3-13-periodicity-transition-metals-1--1.html" title="3 & 13. Periodicity & transition metals (1) ">3 & 13. Periodicity & transition metals (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16816/3-13-periodicity-transition-metals-2--1.html" title="3 & 13. Periodicity & transition metals (2) ">3 & 13. Periodicity & transition metals (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16861/4-14-chemical-bonding-structure-1-1.html" title="4 & 14. Chemical bonding & structure (1)">4 & 14. Chemical bonding & structure (1)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16862/4-14-chemical-bonding-structure-2-1.html" title="4 & 14. Chemical bonding & structure (2)">4 & 14. Chemical bonding & structure (2)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16894/5-15-energetics-thermochemistry-1--1.html" title="5 & 15. Energetics & thermochemistry (1) ">5 & 15. Energetics & thermochemistry (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../16893/5-15-energetics-thermochemistry-2--1.html" title="5 & 15. Energetics & thermochemistry (2) ">5 & 15. Energetics & thermochemistry (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17654/6-16-chemical-kinetics-1--1.html" title="6 & 16. Chemical kinetics (1) ">6 & 16. Chemical kinetics (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17655/6-16-chemical-kinetics-2--1.html" title="6 & 16. Chemical kinetics (2) ">6 & 16. Chemical kinetics (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17471/7-17-equilibrium-1--1.html" title="7 & 17. Equilibrium (1) ">7 & 17. Equilibrium (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17472/7-17-equilibrium-2--1.html" title="7 & 17. Equilibrium (2) ">7 & 17. Equilibrium (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17421/8-18-acids-bases-1--1.html" title="8 & 18. Acids & bases (1) ">8 & 18. Acids & bases (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17422/8-18-acids-bases-2--1.html" title="8 & 18. Acids & bases (2) ">8 & 18. Acids & bases (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17417/9-19-redox-processes-1--1.html" title="9 & 19 Redox processes (1) ">9 & 19 Redox processes (1) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17418/9-19-redox-processes-2--1.html" title="9 & 19. Redox processes (2) ">9 & 19. Redox processes (2) </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../17413/10-20-organic-chemistry-1--1.html" title="10 & 20. 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</div><section id="main-content"><div id="toc-1672971926" class="toc"><a href="#" class="toc-switcher" title="Show table of contents"><small><i class="fa fa-reorder"></i> Table of contents <span class="pull-right"><i class="fa fa-chevron-down"></i></span></small></a></div><h1><img alt="" height="16" src="../../../img/tib-icons/standard-level-24-1.png" title="" width="16"> <img alt="" height="16" src="../../../img/tib-icons/higher-level-24-1.png" title="" width="16"> 5.1 Measuring energy changes (4 hours)</h1><p style="text-align: center;"><img alt="" class="noborder" src="../../../ib/chemistry/images/2014%20Core%20%26%20AHL/Topics-5---15/exothermic-reaction.jpg" style="width: 479px; height: 480px;"></p><p style="text-align: center;">All fossil fuels provide their energy through an exothermic reaction involving combusting the fuel in air.</p><hr class="hidden"><div class="pinkBg"><div><h2>Pause for thought</h2><p><strong>1. Problems with enthalpy diagrams</strong></p><p>It is not difficult to find enthalpy level diagrams in books or on the Internet and most teachers will draw out simple ones themselves. The typical diagram below which actually gives the values for two specific reactions, one exothermic and one endothermic is from the website avogadro.co.uk.</p><hr class="hidden"><p style="text-align: center; "><img _cke_saved_src="../../../ib/chemistry/images/Core and AHL/Energetics/enthalp level diagrams.gif" alt="" class="noborder" height="185" src="../../../ib/chemistry/images/Core%20and%20AHL/Energetics/enthalp%20level%20diagrams.gif" title="Enthalpy level diagram from avogadro.co.uk" width="510"></p><hr class="hidden"><p>What is perhaps not appreciated is the labelling of the y-axis. It is an enthalpy diagram so it should be labelled enthalpy as above - the problem is that no scale can ever be given as the enthalpy values for both the reactants and the products can never be known. This important fact is not obvious from these diagrams and there is a danger that they can give a misleading message to students if this fact is not made clear. All that can ever be measured is the difference between the two values, i.e. the enthalpy change, Δ<em>H</em>. The x-axis also causes some problems. 'Progress of reaction' is often used when the activation energy or some intermediate is also shown on the diagram. All that a simple enthalpy level diagram shows is the initial and final states and they could quite legitimately be placed one above the other so that no x-axis is required (as we do for energy diagrams of energy levels within an atom).</p><hr class="hidden"><p><strong>2. What is the 'true' value?</strong></p><p><img _cke_saved_src="../../../ib/chemistry/images/Core and AHL/Energetics/enthalpy1.gif" alt="" class="noborder right" height="205" src="../../../ib/chemistry/images/Core%20and%20AHL/Energetics/enthalpy1.gif" width="216">One of the best practicals for students to do is to determine the enthalpy of combustion of a flammable liquid using a spirit burner underneath a beaker containing a known mass of water (see right). The experiment is fraught with problems such as incomplete combustion, heat loss and mass loss through evaporation when finding the mass of the burner before and after the combustion. However the calculations involved in determining the result cover this sub-topic well and the experiment also lends itself to a thorough and meaningful evaluation and a discussion as to how the experimental method could be improved. To do this thoroughly the literature ('accepted') value needs to be known so that the percentage error can be determined. The problem is "What is the literature value?"</p><p>The IB seems to place great emphasis on students stating their experimental value together with the total uncertainties. Yet the various data books available never state an uncertainty in their values. One liquid that could be used in the spirit burner is methylbenzene (toluene). The following values can be found in the standard data books for the enthalpy of combustion of methylbenzene.</p><p><img _cke_saved_src="../../../ib/chemistry/images/Core and AHL/Energetics/Toluene.png" alt="" class="left noborder" src="../../../ib/chemistry/images/Core%20and%20AHL/Energetics/Toluene.png" style="width: 134px; height: 180px;" title="methylbenzene (toluene)"></p><p>Literature values for the enthalpy of combustion, Δ<em>H</em><sub>c</sub><sup>⦵</sup>, of methylbenzene (left)<span style="color:#0000cd;"><sup>1</sup></span></p><p>1. – 3908 kJ mol<sup>-1</sup><br>2. – 3909 kJ mol<sup>-1</sup><br>3. – 3907 kJ mol<sup>-1</sup><br>4. – 3910 kJ mol<sup>-1</sup></p><p>This emphasises several points. Firstly, that students should give the source of their 'literature value' as different sources give different values and secondly why is the IB so 'hung up' on students at this age calculating all their uncertainties when in the scientific world the recognized data books do not include them? It also strongly elicits the TOK question "Which one is the <strong>true</strong> value?"</p><hr class="hidden"><p>It might also be worth pointing out that some Internet sources give other different values. For example, 5. – 3906 kJ mol<sup>-1</sup> and 6. – 3916 kJ mol<sup>-1</sup>.</p><p><span style="color:#0000cd;"><sup>1</sup></span>Sources:</p><p>1. Handbook of Chemistry and Physics, 72<sup>nd</sup> Ed. 1992<br>2. Chemistry Data Book ,Stark and Wallace, 2<sup>nd</sup> Ed. 1982 and IB Chemistry Data Booklet (pre-2009 version)<br>3. Binas, 1992<br>4. IB Chemistry Data Booklet (post 2009 version)<br>5. <a _cke_saved_href="http://pubs.acs.org/doi/abs/10.1021/je60040a036" href="http://pubs.acs.org/doi/abs/10.1021/je60040a036">J.Chem.Eng.Data, 1969 14 (1), p 102-106</a> (Note this actually gives the value as -934.49 ± 0.12 kilocalories mol<sup>-1</sup><sup> </sup>which is equivalent to -3906 ± 0.5 kJ mol<sup>-1</sup> so it does include uncertainties.)<br>6. <a _cke_saved_href="http://en.wikipedia.org/wiki/Heat_of_combustion" href="http://en.wikipedia.org/wiki/Heat_of_combustion">Wikipedia</a> (Note this gives the value as – 40.589 MJ kg<sup>-1</sup> equivalent to 3740 kJ mol<sup>-1</sup>.<sup> </sup>However this is the Low Heating Value which means the enthalpy of vaporization of water has been subtracted. Adding this value for 4 mols of water gives an extra – 176 kJ of energy which brings the total to – 3916 kJ mol<sup>-1</sup>.</p><hr class="hidden"></div></div><hr class="hidden"><div class="box"><h2><strong>Nature of Science</strong></h2><p>The conservation of energy is an example of one of the fundamental principles of science.<br>Measuring energy transfers between systems and surroundings requires making careful observations.</p><hr class="hidden"></div><hr class="hidden"><div class="box"><table align="left" border="0" cellpadding="10" cellspacing="0"><tbody><tr><td style="width: 50%;" valign="top"><h3><b><span style="font-weight: normal; "></span></b></h3><div class="yellowBg"><div><h2><b><span style="font-weight: normal; "><strong>Learning outcomes</strong></span></b></h2><p>After studying this topic students should be able to:</p><p><strong>Understand:</strong></p><ul><li>Heat is a form of energy.</li><li>Temperature is a measure of the average kinetic energy of the particles.</li><li>Energy is conserved in chemical reactions.</li><li>Endothermic or exothermic chemical reactions involve the transfer of heat between the system and the surroundings.</li><li>The enthalpy change, Δ<em>H</em>, for chemical reactions is measured in kJ mol<sup>-1</sup>.</li><li>Δ<em>H</em><em><sup>⦵</sup></em> is used to express enthalpy changes under standard conditions including standard states.<hr class="hidden"></li></ul><p><strong>Apply their knowledge to:</strong></p><ul><li>Calculate the heat change when the temperature of a pure substance is changed using <em>q</em> = <em>mc</em>Δ<em>T</em><em>.</em></li><li>Perform a calorimetry experiment for an enthalpy of reaction and evaluate the results.</li></ul></div></div></td><td style="width: 50%;" valign="top"><h4><b><span style="font-weight: normal;"></span></b></h4><div class="yellowBg"><div><h4><b><span style="font-weight: normal;"><strong>Clarification notes</strong></span></b></h4><p>Enthalpy changes of formation, Δ<em>H</em><sub>f</sub><sup>⦵</sup><em>, </em>and combustion, Δ<em>H</em><sub>c</sub><sup>⦵</sup>, should be covered.</p><p>Combustion reactions and reactions in aqueous solution should be covered.</p><p>Temperature is not a part of the definition of standard state, but 298 K is commonly used. Standard state refers to the normal, most pure stable state of a substance measured at 100 kPa.</p><p>It can be assumed that the density and specific heat capacities of aqueous solutions are equal to those of water, although students should be aware of this assumption. The specific heat capacity of water is given in Section 2 of the data booklet.</p><p>The heat capacity of the calorimeter and heat losses to the environment need to be considered.</p><hr class="hidden"><h4>International-mindedness</h4><p>The SI unit of temperature is the Kelvin (K). The USA uses the Fahrenheit scale (°F) for all non-scientific communication but almost all other countries use the Celsius scale (°C), which has the same incremental scaling as the Kelvin scale.</p></div></div></td></tr></tbody></table></div><hr class="hidden"><div class="box"><table align="left" border="0" cellpadding="10" cellspacing="0"><tbody><tr><td style="width: 50%;" valign="top"><h2><span style=""><b><span style="font-weight: normal;"><strong>Teaching tips</strong></span></b></span></h2><p>Initially I introduce the topic by getting students to understand that all chemical reactions involve bond breaking and bond formation to emphasise that energetics is a key concept underlying the whole of Chemistry. Chemists cannot ever state the exact potential energy of the reactants and products but they can measure the energy change as products are formed from reactants. It does seem quite obvious that energy is required to break a bond but it is not so intuitively obvious that the same quantity of energy is released when the bond is formed.</p><p>The difference between energy and enthalpy is quite difficult at this level and it will probably suffice to just say that enthalpy equates to heat energy. Technically Δ<em>H</em> refers to the enthalpy change at constant pressure so it actually includes the internal energy of the system minus any work done by the system when it expands (or plus the work done on the system when the volume contracts). I have included a question on in this the accompanying questions but do stress that it is beyond the syllabus.</p><p>This sub-topic is a gift for practical work and students can be given several good practicals to illustrate the theory. Clearly the key to carrying out most enthalpy calculations is knowing exactly what is meant by specific heat capacity. Students should not just learn the expression <em>q</em> = <em>mc</em>Δ<em>T</em> they should understand what is actually happening when the temperature of a substance increases (or decreases). If you stress the units of specific heat capacity, kJ kg<sup>-1</sup> K<sup>-1</sup>, then they do not have to memorize the equation. They can also see that it is not only the mass of the liquid that is changing. If the metal container or stirrer is being heated up then the energy change will involve other values for specific heat capacities and the concept of the heat capacity of the calorimeter can be introduced.</p></td><td style="width: 50%;" valign="top"><h4><b><span style="font-weight: normal; "><strong>Study guide</strong></span></b></h4><p style="margin: 0px 0px 1em; padding: 0px; color: rgb(0, 0, 0); font-size: 1em;"><b><span style="font-weight: normal;"><img alt="" class="left noborder" src="../../../ib/chemistry/images/2014%20Basic%20information/New%20cover.jpg" style="width: 67px; height: 96px;"></span></b></p><p style="margin: 0px 0px 1em; padding: 0px; color: rgb(0, 0, 0); font-size: 1em;"></p><hr class="hidden"><p style="margin: 0px 0px 1em; padding: 0px; color: rgb(0, 0, 0); font-size: 1em;"><b><span style="font-weight: normal;">Pages 38 & 39</span></b></p><hr class="hidden"><h2><strong><strong>Questions</strong></strong></h2><p><span style="font-family: 'Arial Narrow', Arial, Helvetica, sans-serif; font-size: 17px; color: rgb(0, 51, 102); font-weight: bold; "><b><span style="font-weight: normal;"> </span></b></span>For ten 'quiz' multiple choice questions with the answers explained see <a href="../24581/mc-test-measuring-energy-changes-1.html" title="Core & AHL » Teaching each topic & sub-topic » Topics 5 & 15 » Measuring energy changes » MC test: Measuring energy changes">MC test: Measuring energy changes</a>.</p><p style="margin: 0px 0px 1em; padding: 0px; color: rgb(0, 0, 0); font-size: 1em;">For short-answer questions which can be set as an assignment for a test, homework or given for self study together with model answers see <a href="../39536/measuring-energy-changes-questions--1.html" title="Core & AHL » Teaching each topic & sub-topic » Topics 5 & 15 » Measuring energy changes » Measuring energy changes questions ">Measuring energy changes questions</a>.</p><hr class="hidden"><h4><span style=""><b><span style="font-weight: normal;"><strong>Vocabulary list:</strong></span></b></span></h4><p>endothermic<br>exothermic<br>enthalpy<br>enthalpy diagram<br>specific heat capacity<br>calorimeter<br>standard enthalpy change of reaction, Δ<em>H</em><img class="ico" src="../../../img/icons/underground.png"></p><hr class="hidden"><h4><strong><strong>IM, TOK, 'Utilization' etc.</strong></strong></h4><p>See <a href="../17270/topics-5-15--1.html">separate page</a> which covers all of Topic 5.</p><hr class="hidden"><h2><b><span style="font-weight: normal; "><strong>Practical work</strong></span></b></h2><p><a href="chemistry/practicals-for-sl-and-hl/enthalpy-changes.htm"><img src="http://www.thinkib.net/img/icons/lab.png"> </a> <a href="../16644/enthalpy-changes-1.html" title="New 2014 programme (First exams 2016) » Practical scheme of work » Mandatory laboratory components » Enthalpy changes">Enthalpy changes</a><br><br><img src="http://www.thinkib.net/img/icons/lab.png"> Determine the enthalpy change of neutralization of a strong acid with a strong base.</p><p><img src="http://www.thinkib.net/img/icons/lab.png"> Determine the enthalpy of combustion of an alcohol.</p><p><img class="ico" src="../../../img/icons/lab-1.png"> The reaction of ammonium nitrate and barium hydroxide (see video below) is a good example of an endothermic reaction.</p><hr class="hidden"></td></tr></tbody></table></div><hr class="hidden"><div class="greenBg"><h2 id="anchor-12">Teaching slides</h2><p>Teachers may wish to share these slides with students for learning or for reviewing key concepts.</p><div id="myCarousel-13" class="carousel slide" data-id="248"><!-- Carousel items --><div class="carousel-inner"><div class="active item"><a class="fancy" href="../../../tib-galleries/3-248/51-1.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-1.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-2.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-2.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-3.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-3.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-4.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-4.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-5.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-5.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-6.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-6.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-7.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-7.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-8.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-8.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-9.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-9.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div><div class="item"><a class="fancy" href="../../../tib-galleries/3-248/51-10.png" rel="gallery-248" title=""><img alt="" src="files/tib-galleries/3-248/51-10.png"></a><div class="carousel-caption"><p>Measuring energy changes: </p></div></div></div><!-- Carousel nav --><a class="carousel-control left" href="#myCarousel-13" data-slide="prev">‹</a><a class="carousel-control right" href="#myCarousel-13" data-slide="next">›</a><div class="tib-indicators"><img class="" title="Click to view" style="margin: 10px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-1-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-2-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-3-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-4-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-5-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-6-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-7-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-8-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-9-thumb128.jpg"><img class="" title="Click to view" style="margin: 5px 4px; width: 48px; height: 48px;" alt="" src="files/tib-galleries/3-248/51-10-thumb128.jpg"></div></div><p> </p></div><div class="blueBg"><h2><span style="font-weight: bold;">Other resources</span></h2><p><strong>1.</strong> A nice demonstration by Professor Bob Burk of Carleton University, Ottowa of an endothermic reaction between two solids, barium hydroxide and ammonium nitrate. It also illustrates the importance of entropy change too.</p><p style="text-align: center; "><object height="280" width="360"><param name="quality" value="high"><param name="allowScriptAccess" value="always"><param name="movie" value="http://www.youtube.com/v/5RJLvQXce4A?version=3&hl=en_US&rel=0"><param name="allowscriptaccess" value="always"><embed allowscriptaccess="always" height="280" quality="high" src="http://www.youtube.com/v/5RJLvQXce4A?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="360"></object></p><p style="text-align: center; "><iframe allowfullscreen="" frameborder="0" height="280" src="//www.youtube.com/embed/5RJLvQXce4A?rel=0" width="360"></iframe></p><p style="text-align: center; "><a href="http://youtu.be/5RJLvQXce4A">endothermic reaction <img class="ico" src="../../../img/icons/video-1.png"><span class="anchor" id="video-1" name="video-1"> </span> </a></p><p style="text-align: center; "></p><hr class="hidden"><p><strong>2.</strong> One for you to try at home - or perhaps not? An exothermic reaction in the palm of your hand.</p><p style="text-align: center; "><iframe allowfullscreen="" frameborder="0" height="280" src="//www.youtube.com/embed/1cdV3rX0TSA?rel=0" width="360"></iframe></p><p style="text-align: center; "><a href="http://youtu.be/1cdV3rX0TSA">exothermic reaction <img class="ico" src="../../../img/icons/video-1.png"><span class="anchor" id="video-2" name="video-2"> </span></a></p><hr class="hidden"><p><strong>3.</strong> Students know that their own calorimetry experiments give poor results due mainly to heat loss and incomplete combustion. This video shows how a bomb calorimeter works to overcome these problems and determine accurate enthalpies of combustion. (Remember though that a bomb calorimeter is not on the syllabus.)</p><hr class="hidden"><div style="text-align: center;"><iframe allowfullscreen="" frameborder="0" height="280" src="//www.youtube.com/embed/ohyA9amFfsc" width="360"></iframe></div><div style="text-align: center;"><a href="http://youtu.be/ohyA9amFfsc" target="_blank" title="Videos"><img class="ico" src="../../../img/icons/video-1.png"><span class="anchor" id="video-3" name="video-3"> </span> bomb calorimeter </a><hr class="hidden"></div></div></section></article><section id="media-extras"><div class="page-actions no-print navbar inline hidden-desktop"><div class="navbar-inner"><ul class="nav"><li><a class="presentation" href="#" onclick="return false;"><i class="fa fa-desktop"></i></a></li><li><a class="print-section-blog" href="#" onclick="return false;"><i class="fa fa-print"></i></a></li><li><a class="page-bookmarker" data-ticket="IB Docs (2) Team" data-pid="17685" href="#" onclick="return false;"><i class="fa fa-star"></i></a></li><li><a class="personal-notes" href="#" onclick="return false;"><i class="fa fa-file-text"></i></a></li><li><a class="" data-toggle="modal" href="#modal-feedback" onclick="return false;"><i class="fa fa-envelope-o"></i></a></li><li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" data-target="#" href="#"><i class="fa fa-share-alt"></i></a><ul class="dropdown-menu" role="menu"><li><a class="" target="_blank" title="Share on Twitter" href="https://twitter.com/share?text=%22Measuring+energy+changes%22+-+via+%40InThinker+%23chemistry%0A&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F17685%2Fmeasuring-energy-changes"><i class="fa fa-twitter-square"></i><span>Twitter</span></a></li><li><a class="" target="_blank" title="Share on Facebook" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F17685%2Fmeasuring-energy-changes&t=Measuring+energy+changes"><i class="fa fa-facebook-square"></i><span>Facebook</span></a></li><li><a class="" href="http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F17685%2Fmeasuring-energy-changes"><i class="fa fa-linkedin-square"></i><span>LinkedIn</span></a></li><li><a class="" href="https://plus.google.com/share?url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F17685%2Fmeasuring-energy-changes"><i class="fa fa-google-plus-square"></i><span>Google +</span></a></li><li><a class="" href="mailto:?subject=Measuring energy changes&body=All fossil fuels provide their energy through an exothermic reaction involving combusting the fuel in air.1. 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