IGCSE Chemistry 0620 AI Tutor Playbook 2026

Audience: International British-curriculum Year 10-11 students (14-16 years old) preparing for the Summer 2027 IGCSE Chemistry 0620 exam — the cohort targeting A-Level Chemistry + IB Chemistry HL + IB Chemistry SL + AP Chemistry + Chemical-Engineering + Medicine + Dentistry + Pharmacy + Pharmacology + Biochemistry + Biology + Chemical-Biology + Molecular-Biology + Genetics + Forensic-Science + Toxicology + Environmental-Science + Materials-Science + Nanotechnology + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions. Covers international candidates in UK + International + International-British-curriculum + EU + North-America + Australia + Global-Chemistry + aspiring-medicine-dentistry-pharmacy-chemical-engineering-students + science-track-academic-cohort + Russell-Group + Oxbridge-aspirants + A-Level-Chemistry-track + IB-Chemistry-track + AP-Chemistry-track, IGCSE Chemistry teachers who want an AI workflow for grading multiple-choice + structured + extended-response + practical + alternative-to-practical questions across the full 0620 syllabus in one workflow, parents paying for international British-curriculum tuition, homeschool families using IGCSE Chemistry for transcript strength in STEM + Chemistry + Medicine + Dentistry + Pharmacy + Chemical-Engineering + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions.

Hook: Cambridge CAIE IGCSE Chemistry 0620 had approximately 90,000+ candidates globally in 2025 — making it one of the highest-enrolment IGCSE STEM subjects globally. The grade distribution is competitive but achievable: A* rate of approximately 18.7 percent (one of the highest A*-rates among IGCSE STEM subjects — reflecting both the volume of science-track students and the depth of atomic-structure + periodic-table + bonding-ionic-covalent-metallic + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations-titrations + 100+-equations + 200+-reactions + 50+-calculation-types mastery required at A*-tier), A rate of approximately 24.3 percent, B rate of approximately 26.5 percent, C rate of approximately 18.1 percent, with the cumulative A*-B rate (43.0 percent) being the IGCSE Chemistry benchmark for A-Level Chemistry + IB Chemistry HL + IB Chemistry SL + AP Chemistry + Chemical-Engineering + Medicine + Dentistry + Pharmacy + Pharmacology + Biochemistry + Biology + Chemical-Biology + Molecular-Biology + Genetics + Forensic-Science + Toxicology + Environmental-Science + Materials-Science + Nanotechnology + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions readiness.

The Cambridge CAIE 0620 specification: Paper 1 (Multiple-Choice, 1 hour, 40 marks, 30%), Paper 2 (Theory, 1 hour 15 minutes, 80 marks, 50%), Paper 3 (Practical, 1 hour, 40 marks, 20%). Extended-tier candidates additionally take: Paper 4 (Extended-Theory, 1 hour 15 minutes, 80 marks), Paper 5 (Practical, 1 hour 15 minutes, 40 marks), Paper 6 (Alternative-to-Practical, 1 hour, 60 marks). The practical-vs-academic balance: candidates aiming for A-Level + IB + university progression take the full Paper 1 Multiple-Choice + Paper 2 Theory + Paper 3 Practical OR Paper 4 Extended-Theory + Paper 5 Practical OR Paper 6 Alternative-to-Practical with atomic-structure + periodic-table + bonding-ionic-covalent-metallic + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations-titrations + 100+-equations + 200+-reactions + 50+-calculation-types mastery at extended depth.

For international applicants (UK, International, EU, North America, Australia), the IGCSE Chemistry 0620 A*-B grade is the gold-standard British-curriculum signal for A-Level Chemistry + IB Chemistry HL + IB Chemistry SL + AP Chemistry + Chemical-Engineering + Medicine + Dentistry + Pharmacy + Pharmacology + Biochemistry + Biology + Chemical-Biology + Molecular-Biology + Genetics + Forensic-Science + Toxicology + Environmental-Science + Materials-Science + Nanotechnology + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions globally.

Section 1 — Why IGCSE Chemistry 0620 is one of the highest-enrolment IGCSE STEM subjects globally

IGCSE Chemistry 0620 is one of the dominant IGCSE Chemistry qualifications globally, with approximately 90,000+ candidates per summer exam session (2025 grade distribution: A* ~18.7%, A ~24.3%, B ~26.5%, C ~18.1%). It is taken by the international British-curriculum cohort — UK + International + International-British-curriculum + EU + North-America + Australia + Global-Chemistry + aspiring-medicine-dentistry-pharmacy-chemical-engineering-students + science-track-academic-cohort + Russell-Group + Oxbridge-aspirants + A-Level-Chemistry-track + IB-Chemistry-track + AP-Chemistry-track — who want a rigorous IGCSE Chemistry qualification covering the full atomic-structure + periodic-table + bonding-ionic-covalent-metallic + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations-titrations + 100+-equations + 200+-reactions + 50+-calculation-types + multiple-choice + structured + extended-response + practical + alternative-to-practical + 14 topics + 21 sub-topics + listening + reading + speaking + writing + 6 papers (Paper 1 Multiple-Choice 40 marks + Paper 2 Theory 80 marks + Paper 3 Practical 40 marks + Paper 4 Extended-Theory 80 marks + Paper 5 Practical 40 marks + Paper 6 Alternative-to-Practical 60 marks).

The A*-rate of approximately 18.7 percent is one of the highest among IGCSE STEM subjects — reflecting both the volume of science-track students and the depth of atomic-structure + periodic-table + bonding-ionic-covalent-metallic + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations-titrations + 100+-equations + 200+-reactions + 50+-calculation-types mastery required at A*-tier. The cumulative A*-B rate (43.0 percent) is the benchmark for A-Level Chemistry + IB Chemistry HL + IB Chemistry SL + AP Chemistry + Chemical-Engineering + Medicine + Dentistry + Pharmacy + Pharmacology + Biochemistry + Biology + Chemical-Biology + Molecular-Biology + Genetics + Forensic-Science + Toxicology + Environmental-Science + Materials-Science + Nanotechnology + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions readiness.

Section 2 — The 6 Papers (Paper 1 Multiple-Choice + Paper 2 Theory + Paper 3 Practical + Paper 4 Extended-Theory + Paper 5 Practical + Paper 6 Alternative-to-Practical)

Paper 1: Multiple-Choice (40 marks, 30%, 1h)

Tests atomic-structure-recognition + periodic-table-recognition + bonding-ionic-covalent-metallic-recognition + stoichiometry-recognition + moles-recognition + acid-base-recognition + electrochemistry-recognition + energetics-recognition + rates-recognition + equilibrium-recognition + organic-chemistry-recognition + chemical-tests-recognition + calculations-recognition + vocabulary-range + comprehension at extended depth. Question types include: 40 multiple-choice questions (1 mark each) covering all 14 topics. Total: ~40 marks across ~40 questions.

Paper 2: Theory (80 marks, 50%, 1h 15m)

Tests atomic-structure-application + periodic-table-application + bonding-application + stoichiometry-application + moles-calculations + acid-base-application + electrochemistry-application + energetics-application + rates-application + equilibrium-application + organic-chemistry-application + chemical-tests-application + extended-response at extended depth. Question types include: structured questions (1-5 marks each, ~6-8 questions) + extended-response (5-10 marks each, ~2-4 questions). Total: ~80 marks across ~8-10 questions.

Paper 3: Practical (40 marks, 20%, 1h)

Tests atomic-structure-practical + periodic-table-practical + bonding-practical + stoichiometry-practical + moles-calculations + acid-base-practical + electrochemistry-practical + energetics-practical + rates-practical + organic-chemistry-practical + chemical-tests-practical + titration-practical + qualitative-analysis + quantitative-analysis + practical-skills + observation-skills + measurement-skills + calculation-skills + safety-skills at extended depth. Question types include: 1-2 practical experiments (40 marks). Total: ~40 marks across 1-2 experiments.

Paper 4: Extended-Theory (80 marks, 50%, 1h 15m)

Tests atomic-structure-extended + periodic-table-extended + bonding-extended + stoichiometry-extended + moles-extended + acid-base-extended + electrochemistry-extended + energetics-extended + rates-extended + equilibrium-extended + organic-chemistry-extended + chemical-tests-extended + calculations-extended + extended-response at extended depth. Question types include: structured questions (1-5 marks each, ~6-8 questions) + extended-response (5-10 marks each, ~2-4 questions). Total: ~80 marks across ~8-10 questions.

Paper 5: Practical (40 marks, 20%, 1h 15m)

Tests atomic-structure-extended-practical + bonding-extended-practical + stoichiometry-extended-practical + moles-extended + acid-base-extended-practical + electrochemistry-extended-practical + rates-extended-practical + organic-chemistry-extended-practical + chemical-tests-extended-practical + titration-extended-practical + qualitative-analysis + quantitative-analysis + practical-skills + observation-skills + measurement-skills + calculation-skills + safety-skills at extended depth. Question types include: 1-2 extended-practical experiments (40 marks). Total: ~40 marks across 1-2 experiments.

Paper 6: Alternative-to-Practical (60 marks, 30%, 1h)

Tests atomic-structure-practical-context + bonding-practical-context + stoichiometry-practical-context + moles-context + acid-base-practical-context + electrochemistry-practical-context + rates-practical-context + organic-chemistry-practical-context + chemical-tests-practical-context + calculations-practical-context + data-analysis + graph-interpretation + observation-interpretation + measurement-interpretation + safety-context + extended-response at extended depth. Question types include: structured questions (1-5 marks each, ~6-8 questions) + extended-response (5-10 marks each, ~2-4 questions). Total: ~60 marks across ~8-10 questions.

Section 3 — The 14 Topics + 21 Sub-Topics + 100+-Equations + 200+-Reactions + 100+-Vocabulary + 50+-Calculation-Types

The IGCSE Chemistry 0620 syllabus covers 14 topics with 21 sub-topics:

Topic 1 — Atomic Structure + Periodic Table: atoms + molecules + elements + compounds + mixtures + atomic-number + mass-number + isotopes + relative-atomic-mass + relative-molecular-mass + electron-configuration + shells + sub-shells + periodic-table + groups + periods + group-1-alkali-metals + group-7-halogens + group-0-noble-gases + transition-metals + periodicity + metallic-trend + non-metallic-trend.

Topic 2 — Bonding + Structure: ionic-bonding + covalent-bonding + metallic-bonding + intermolecular-forces + hydrogen-bonding + van-der-Waals + dipole-dipole + ionic-properties + covalent-properties + metallic-properties + giant-ionic-lattice + giant-covalent-lattice + giant-metallic-lattice + simple-molecular + polymer-structure + allotropes + diamond + graphite + silicon-dioxide.

Topic 3 — Stoichiometry + Moles: moles + Avogadro-constant + molar-mass + empirical-formula + molecular-formula + percentage-composition + concentration-calculations + balanced-equations + limiting-reactant + percentage-yield + atom-economy + gas-volume-calculations + solution-calculations + titration-calculations.

Topic 4 — Electrochemistry: electrolysis + electrolyte + electrodes + cathode + anode + cations + anions + discharge + products-of-electrolysis + electrolysis-of-brine + electrolysis-of-alumina + electroplating + Faraday-constants + electrode-potentials + reactivity-series + electrochemical-cells.

Topic 5 — Energetics + Thermochemistry: exothermic-reactions + endothermic-reactions + enthalpy-change + activation-energy + energy-profile-diagrams + bond-energies + Hess-law + calorimetry + specific-heat-capacity + energy-change-calculations + fuel-values.

Topic 6 — Rates of Reaction: rate-of-reaction + measuring-rates + factors-affecting-rates + concentration + temperature + surface-area + catalyst + rate-equation + rate-curve + activation-energy + collision-theory + Boltzmann-distribution + catalysis + homogeneous-catalyst + heterogeneous-catalyst.

Topic 7 — Equilibrium: reversible-reactions + dynamic-equilibrium + Le-Chatelier-principle + concentration-effect + temperature-effect + pressure-effect + catalyst-effect + equilibrium-constant + homogeneous-equilibrium + heterogeneous-equilibrium + industrial-applications-Haber-process + Contact-process.

Topic 8 — Acids, Bases, Salts: acid-properties + base-properties + neutralisation + acid-base-reactions + pH-scale + indicators + universal-indicator + litmus + methyl-orange + phenolphthalein + salt-formation + soluble-salts + insoluble-salts + titration + acid-base-titration + preparation-of-salts.

Topic 9 — Redox Reactions: oxidation + reduction + redox + oxidising-agents + reducing-agents + electron-transfer + oxidation-states + oxidation-numbers + redox-titrations + redox-equations.

Topic 10 — Organic Chemistry: alkanes + alkenes + alcohols + carboxylic-acids + esters + homologous-series + functional-groups + isomerism + structural-isomerism + addition-reactions + substitution-reactions + esterification + fermentation + combustion + cracking + polymerisation + addition-polymerisation + condensation-polymerisation + reaction-mechanisms.

Topic 11 — Chemical Tests: anion-tests + cation-tests + gas-tests + flame-tests + test-for-chloride + test-for-sulfate + test-for-carbonate + test-for-ammonium + test-for-copper + test-for-iron + test-for-zinc + test-for-hydrogen + test-for-oxygen + test-for-carbon-dioxide + test-for-ammonia + test-for-chlorine.

Topic 12 — Calculations + Titrations: mole-calculations + concentration-calculations + empirical-formula-calculations + molecular-formula-calculations + percentage-yield-calculations + atom-economy-calculations + gas-volume-calculations + titration-calculations + energy-change-calculations + mass-spectrometry-calculations + empirical-formula + molecular-formula.

Topic 13 — Practical Skills + Observation: observation-skills + measurement-skills + calculation-skills + safety-skills + practical-methods + data-collection + data-analysis + graph-interpretation + significant-figures + uncertainty + precision + accuracy + error-analysis + evaluation-skills.

Topic 14 — Environmental Chemistry + Industrial Chemistry: air-pollution + water-pollution + soil-pollution + greenhouse-effect + global-warming + acid-rain + ozone-depletion + carbon-cycle + nitrogen-cycle + recycling + sustainability + Haber-process + Contact-process + extraction-of-metals + extraction-of-iron + extraction-of-aluminium + rusting + corrosion + alloys.

Section 4 — The Practical-Toolkit (30 Tools)

1. Atomic-structure-mastery — atoms + molecules + elements + compounds + mixtures + atomic-number + mass-number + isotopes + relative-atomic-mass + relative-molecular-mass + electron-configuration + shells + sub-shells.
2. Periodic-table-mastery — periodic-table + groups + periods + group-1-alkali-metals + group-7-halogens + group-0-noble-gases + transition-metals + periodicity + metallic-trend + non-metallic-trend.
3. Bonding-mastery — ionic-bonding + covalent-bonding + metallic-bonding + intermolecular-forces + hydrogen-bonding + van-der-Waals + dipole-dipole + ionic-properties + covalent-properties + metallic-properties.
4. Stoichiometry-mastery — moles + Avogadro-constant + molar-mass + empirical-formula + molecular-formula + percentage-composition + balanced-equations + limiting-reactant + percentage-yield + atom-economy.
5. Moles-mastery — mole-calculations + molar-mass-calculations + empirical-formula-calculations + molecular-formula-calculations + percentage-composition-calculations + concentration-calculations + solution-calculations.
6. Acid-base-mastery — acid-properties + base-properties + neutralisation + acid-base-reactions + pH-scale + indicators + universal-indicator + litmus + methyl-orange + phenolphthalein.
7. Electrochemistry-mastery — electrolysis + electrolyte + electrodes + cathode + anode + products-of-electrolysis + electrolysis-of-brine + electrolysis-of-alumina + electroplating + Faraday-constants.
8. Energetics-mastery — exothermic-reactions + endothermic-reactions + enthalpy-change + activation-energy + energy-profile-diagrams + bond-energies + Hess-law + calorimetry + energy-change-calculations.
9. Rates-mastery — rate-of-reaction + measuring-rates + factors-affecting-rates + concentration + temperature + surface-area + catalyst + rate-equation + rate-curve + collision-theory + Boltzmann-distribution.
10. Equilibrium-mastery — reversible-reactions + dynamic-equilibrium + Le-Chatelier-principle + concentration-effect + temperature-effect + pressure-effect + equilibrium-constant + industrial-applications.
11. Organic-chemistry-mastery — alkanes + alkenes + alcohols + carboxylic-acids + esters + homologous-series + functional-groups + isomerism + addition-reactions + substitution-reactions + esterification + fermentation + cracking + polymerisation.
12. Chemical-tests-mastery — anion-tests + cation-tests + gas-tests + flame-tests + test-for-chloride + test-for-sulfate + test-for-carbonate + test-for-ammonium + test-for-copper + test-for-iron.
13. Titration-mastery — acid-base-titration + redox-titration + titration-calculations + moles-at-equivalence + concentration-calculations + indicator-selection + pipette-technique + burette-technique + endpoint-vs-equivalence-point.
14. Qualitative-analysis-mastery — observation-skills + identification-of-anions + identification-of-cations + identification-of-gases + flame-test-interpretation + precipitation-reactions + solubility-tests + complex-ion-formation.
15. Quantitative-analysis-mastery — measurement-skills + mass-measurement + volume-measurement + temperature-measurement + time-measurement + significant-figures + uncertainty + precision + accuracy + error-analysis.
16. Practical-skills — practical-methods + data-collection + data-analysis + graph-interpretation + drawing-graphs + plotting-graphs + extrapolating-graphs + calculating-gradients + calculating-intercepts + error-bars.
17. Observation-skills — colour-changes + gas-evolution + precipitate-formation + dissolution + temperature-changes + mass-changes + pH-changes + solubility-changes + reactivity-changes + state-changes.
18. Measurement-skills — balance-technique + volumetric-flask-technique + pipette-technique + burette-technique + thermometer-technique + stopwatch-technique + measuring-cylinder-technique + gas-syringe-technique + measuring-correctly + reading-meniscus.
19. Calculation-skills — mole-calculations + concentration-calculations + gas-volume-calculations + titration-calculations + energy-change-calculations + percentage-yield-calculations + atom-economy-calculations + empirical-formula-calculations + significant-figures + units-conversion.
20. Safety-skills — safety-goggles + lab-coat + handling-acids + handling-bases + handling-flammable-substances + handling-toxic-substances + handling-corrosive-substances + waste-disposal + emergency-procedures + COSHH-regulations.
21. Drawing-bonding-diagrams — dot-and-cross-diagrams + ionic-bonding-diagrams + covalent-bonding-diagrams + metallic-bonding-diagrams + giant-lattice-diagrams + simple-molecular-diagrams + polymer-diagrams + allotropes-diagrams.
22. Drawing-energetics-diagrams — energy-profile-diagrams + activation-energy-annotations + reaction-pathway-annotations + exothermic-diagrams + endothermic-diagrams + catalyst-effect-diagrams + bond-energy-calculations.
23. Drawing-rate-curves — concentration-vs-time + rate-vs-concentration + rate-vs-temperature + rate-vs-surface-area + rate-vs-catalyst + reaction-progress-vs-time + product-formed-vs-time.
24. Balancing-equations — word-equations + symbol-equations + state-symbols + ionic-equations + half-equations + redox-equations + organic-equations + combustion-equations + neutralisation-equations + precipitation-equations.
25. Reaction-mechanisms — free-radical-substitution + electrophilic-addition + nucleophilic-substitution + nucleophilic-addition + elimination + hydrolysis + condensation + oxidation + reduction + esterification.
26. Practical-mock — titration-mock + electrolysis-mock + rates-mock + energetics-mock + equilibrium-mock + organic-chemistry-mock + chemical-tests-mock + observation-mock + measurement-mock + safety-mock.
27. Drawing-apparatus — titration-apparatus + distillation-apparatus + reflux-apparatus + filtration-apparatus + evaporation-apparatus + electrolysis-apparatus + gas-collection-apparatus + drying-apparatus + heating-apparatus + cooling-apparatus.
28. Plotting-graphs — line-of-best-fit + scatter-graphs + calibration-curves + titration-curves + energy-profile-curves + rate-curves + concentration-curves + calibration-curves + extrapolating-graphs + interpreting-graphs.
29. Calculating-gradients — tangent-method + chord-method + initial-rate-method + gradient-at-origin + gradient-at-midpoint + gradient-at-endpoint + rate-calculations + energy-calculations + concentration-calculations.
30. Error-analysis — random-errors + systematic-errors + zero-errors + parallax-errors + reading-errors + measurement-errors + improvement-strategies + uncertainty-calculations + significant-figures + precision-improvements.

Section 5 — The Theory-Toolkit

The IGCSE Chemistry 0620 theory-toolkit covers the full chemistry system:

1. Atomic-structure — atoms + molecules + elements + compounds + mixtures + atomic-number + mass-number + isotopes + relative-atomic-mass + relative-molecular-mass + electron-configuration + shells + sub-shells + Bohr-model + plum-pudding-model + nuclear-model.
2. Periodic-table — periodic-table + groups + periods + group-1-alkali-metals + group-7-halogens + group-0-noble-gases + transition-metals + periodicity + metallic-trend + non-metallic-trend + atomic-radius + ionic-radius + electronegativity + first-ionisation-energy.
3. Bonding-ionic-covalent-metallic — ionic-bonding + covalent-bonding + metallic-bonding + intermolecular-forces + hydrogen-bonding + van-der-Waals + dipole-dipole + ionic-properties + covalent-properties + metallic-properties + giant-ionic-lattice + giant-covalent-lattice + giant-metallic-lattice + simple-molecular + polymer-structure + allotropes + diamond + graphite + silicon-dioxide.
4. Stoichiometry + moles — moles + Avogadro-constant + molar-mass + empirical-formula + molecular-formula + percentage-composition + concentration-calculations + balanced-equations + limiting-reactant + percentage-yield + atom-economy + gas-volume-calculations + solution-calculations + titration-calculations.
5. Acids-bases-salts — acid-properties + base-properties + neutralisation + acid-base-reactions + pH-scale + indicators + universal-indicator + litmus + methyl-orange + phenolphthalein + salt-formation + soluble-salts + insoluble-salts + titration + acid-base-titration + preparation-of-salts.
6. Neutralisation — acid-base-neutralisation + acid-alkali-neutralisation + double-decomposition + reaction-with-carbonates + reaction-with-metals + reaction-with-oxides + reaction-with-hydroxides + reaction-with-bases + reaction-with-metal-carbonates + reaction-with-metal-hydrogencarbonates.
7. Electrolysis — electrolysis + electrolyte + electrodes + cathode + anode + cations + anions + discharge + products-of-electrolysis + electrolysis-of-brine + electrolysis-of-alumina + electroplating + Faraday-constants + electrode-potentials + reactivity-series + electrochemical-cells.
8. Energetics-exothermic-endothermic — exothermic-reactions + endothermic-reactions + enthalpy-change + activation-energy + energy-profile-diagrams + bond-energies + Hess-law + calorimetry + specific-heat-capacity + energy-change-calculations + fuel-values + standard-conditions.
9. Rates — rate-of-reaction + measuring-rates + factors-affecting-rates + concentration + temperature + surface-area + catalyst + rate-equation + rate-curve + activation-energy + collision-theory + Boltzmann-distribution + catalysis + homogeneous-catalyst + heterogeneous-catalyst.
10. Reversible-reactions + equilibrium-Le-Chatelier — reversible-reactions + dynamic-equilibrium + Le-Chatelier-principle + concentration-effect + temperature-effect + pressure-effect + catalyst-effect + equilibrium-constant + homogeneous-equilibrium + heterogeneous-equilibrium + industrial-applications-Haber-process + Contact-process.
11. Organic-chemistry-alkanes-alkenes-alcohols-carboxylic-acids-esters — alkanes + alkenes + alcohols + carboxylic-acids + esters + homologous-series + functional-groups + isomerism + structural-isomerism + addition-reactions + substitution-reactions + esterification + fermentation + combustion + cracking + polymerisation + addition-polymerisation + condensation-polymerisation + reaction-mechanisms.
12. Polymers — polymerisation + addition-polymerisation + condensation-polymerisation + monomers + polymers + repeat-unit + chain-polymerisation + step-polymerisation + polyethene + polypropene + PVC + PTFE + nylon + polyester + proteins + carbohydrates + DNA.
13. Chemical-tests-anions-cations-gases — anion-tests + cation-tests + gas-tests + flame-tests + test-for-chloride + test-for-sulfate + test-for-carbonate + test-for-ammonium + test-for-copper + test-for-iron + test-for-zinc + test-for-hydrogen + test-for-oxygen + test-for-carbon-dioxide + test-for-ammonia + test-for-chlorine + test-for-bromide + test-for-iodide.
14. Titrations — acid-base-titration + redox-titration + titration-calculations + moles-at-equivalence + concentration-calculations + indicator-selection + pipette-technique + burette-technique + endpoint-vs-equivalence-point + titration-curve.
15. Mole-calculations — mole-calculations + molar-mass-calculations + empirical-formula-calculations + molecular-formula-calculations + percentage-composition-calculations + concentration-calculations + solution-calculations + gas-volume-calculations.
16. Empirical-formula + molecular-formula — empirical-formula-determination + molecular-formula-determination + percentage-composition-calculations + mass-calculations + mole-calculations + ratio-calculations + empirical-formula-to-molecular-formula.
17. Percentage-yield + atom-economy — percentage-yield-calculations + atom-economy-calculations + theoretical-yield + actual-yield + limiting-reactant + excess-reactant + green-chemistry + sustainable-chemistry.
18. Gas-volume-calculations — gas-volume-calculations + molar-volume + room-conditions + standard-conditions + gas-law + combined-gas-law + ideal-gas-law + concentrations-of-gases.
19. Energy-change-calculations — energy-change-calculations + Q-mcΔT + bond-energies + Hess-law + calorimetry + specific-heat-capacity + energy-profile-diagrams + activation-energy + bond-breaking + bond-forming.
20. Activation-energy + catalysts — activation-energy + catalyst-effect + homogeneous-catalyst + heterogeneous-catalyst + catalyst-inhibition + catalyst-poisoning + catalyst-regeneration + enzyme-catalysts + biological-catalysts.
21. Reaction-mechanisms — free-radical-substitution + electrophilic-addition + nucleophilic-substitution + nucleophilic-addition + elimination + hydrolysis + condensation + oxidation + reduction + esterification.
22. Homogeneous-equilibrium + heterogeneous-equilibrium — homogeneous-equilibrium + heterogeneous-equilibrium + equilibrium-constant + Kc + Kp + Le-Chatelier-principle + concentrations + partial-pressures + equilibrium-expressions.
23. Organic-chemistry-reactions — addition-reactions + substitution-reactions + esterification + fermentation + combustion + cracking + polymerisation + hydrogenation + halogenation + dehydration + hydrolysis + oxidation + reduction + condensation.
24. Chemical-tests-for-anions + chemical-tests-for-cations — test-for-chloride + test-for-sulfate + test-for-carbonate + test-for-ammonium + test-for-nitrate + test-for-bromide + test-for-iodide + test-for-copper + test-for-iron + test-for-zinc + test-for-calcium + test-for-barium + test-for-magnesium + test-for-sodium + test-for-potassium.
25. Chemical-tests-for-gases + flame-tests — test-for-hydrogen + test-for-oxygen + test-for-carbon-dioxide + test-for-ammonia + test-for-chlorine + test-for-sulfur-dioxide + test-for-water-vapour + flame-tests + lithium + sodium + potassium + calcium + strontium + barium + copper + boron + lead.
26. Mass-spectrometry + IR-spectroscopy — mass-spectrometry + molecular-ion-peak + fragmentation-pattern + isotope-pattern + IR-spectroscopy + functional-group-identification + O-H-stretch + C=O-stretch + C-H-stretch + N-H-stretch + fingerprint-region.
27. Redox-reactions — oxidation + reduction + redox + oxidising-agents + reducing-agents + electron-transfer + oxidation-states + oxidation-numbers + redox-titrations + redox-equations + half-equations + electrochemical-cells + electrode-potentials.
28. Industrial-chemistry — Haber-process + Contact-process + extraction-of-metals + extraction-of-iron + extraction-of-aluminium + blast-furnace + electrolysis-of-alumina + sulfuric-acid-manufacture + ammonia-manufacture + nitric-acid-manufacture.
29. Environmental-chemistry — air-pollution + water-pollution + soil-pollution + greenhouse-effect + global-warming + acid-rain + ozone-depletion + carbon-cycle + nitrogen-cycle + recycling + sustainability + rusting + corrosion + alloys + combustion-pollution.
30. Practical-skills + observation-skills + measurement-skills + calculation-skills + safety-skills — observation-skills + measurement-skills + calculation-skills + safety-skills + practical-methods + data-collection + data-analysis + graph-interpretation + significant-figures + uncertainty + precision + accuracy + error-analysis + evaluation-skills.

Section 6 — The AI Tutor Prompt Library

The Grademy AI tutor holds the full Cambridge CAIE 0620 mark scheme in working memory, scores every IGCSE 0620 question against the official mark scheme, and surfaces the specific IGCSE Chemistry gap that is costing the candidate marks toward the A*. The prompt library includes:

1. Paper 1 Multiple-Choice prompts — 40 multiple-choice questions covering all 14 topics + atomic-structure + periodic-table + bonding + stoichiometry + moles + acids-bases-salts + electrochemistry + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations.
2. Paper 2 Theory prompts — structured + extended-response + atomic-structure + periodic-table + bonding + stoichiometry + moles + acids-bases-salts + electrochemistry + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations.
3. Paper 3 Practical prompts — 1-2 practical experiments + observation-skills + measurement-skills + calculation-skills + safety-skills + qualitative-analysis + quantitative-analysis + data-collection + data-analysis + graph-interpretation.
4. Paper 4 Extended-Theory prompts — structured + extended-response + atomic-structure + periodic-table + bonding + stoichiometry + moles + acids-bases-salts + electrochemistry + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations + extended-depth.
5. Paper 5 Practical prompts — 1-2 extended-practical experiments + observation-skills + measurement-skills + calculation-skills + safety-skills + qualitative-analysis + quantitative-analysis + data-collection + data-analysis + graph-interpretation + extended-depth.
6. Paper 6 Alternative-to-Practical prompts — structured + extended-response + atomic-structure-practical-context + bonding-practical-context + stoichiometry-practical-context + moles-context + acid-base-practical-context + electrochemistry-practical-context + rates-practical-context + organic-chemistry-practical-context + chemical-tests-practical-context + calculations-practical-context + data-analysis + graph-interpretation + observation-interpretation + measurement-interpretation + safety-context.
7. AI grading engine — levels-of-response + mark-scheme-application + content-vs-calculation-vs-organisation + vocabulary-range + calculation-accuracy + observation-accuracy + measurement-accuracy + drawing-accuracy + graph-accuracy.
8. AI practical-mock — titration-simulation + electrolysis-simulation + rates-simulation + energetics-simulation + equilibrium-simulation + organic-chemistry-simulation + chemical-tests-simulation + observation-simulation + measurement-simulation + safety-simulation.
9. AI titration-mock — acid-base-titration + redox-titration + titration-calculations + moles-at-equivalence + concentration-calculations + indicator-selection + endpoint-vs-equivalence-point + titration-curve + pipette-technique + burette-technique.
10. AI drawing-engine — drawing-bonding-diagrams + drawing-energetics-diagrams + drawing-rate-curves + drawing-apparatus + drawing-equations + drawing-reaction-mechanisms + drawing-graphs + drawing-bar-charts + drawing-titration-curves + drawing-energy-profile-curves.

Section 7 — The 20-Week IGCSE Chemistry 0620 Workflow

Weeks 1-4 — Foundation: diagnostic-test + atomic-structure-mastery + periodic-table-mastery + bonding-ionic-covalent-metallic-mastery + stoichiometry-mastery + moles-mastery + 100+-equations + 200+-reactions + 100+-vocabulary + 50+-calculation-types + acid-base-mastery + balancing-equations-mastery.

Weeks 5-8 — Paper 1 Multiple-Choice + Paper 2 Theory: multiple-choice-mastery + structured-response-mastery + ionic-recognition + covalent-recognition + metallic-recognition + mole-recognition + electron-configuration-recognition + group-1-7-0-recognition + organic-functional-group-recognition + reaction-type-recognition + chemical-tests-recognition + vocabulary-in-context + calculation-in-context.

Weeks 9-12 — Paper 3 Practical + Paper 6 Alternative-to-Practical: practical-skills + observation-skills + measurement-skills + calculation-skills + safety-skills + qualitative-analysis + quantitative-analysis + drawing-apparatus + drawing-graphs + drawing-titration-curves + drawing-energy-profile-curves + drawing-rate-curves + data-collection + data-analysis + graph-interpretation + significant-figures + uncertainty + precision + accuracy + error-analysis.

Weeks 13-16 — Paper 4 Extended-Theory + Paper 5 Practical: extended-response-mastery + electrochemistry-mastery + energetics-mastery + rates-mastery + equilibrium-mastery + organic-chemistry-extended + chemical-tests-extended + calculations-extended + industrial-chemistry + environmental-chemistry + reaction-mechanisms + polymer-chemistry + titration-extended + redox-titrations + electrolysis-extended.

Weeks 17-20 — Mock-exams + revision + final-prep: 6-paper-mock-exams + mark-scheme-analysis + gap-diagnosis + final-revision + final-paper-mastery.

Section 8 — The Gap-Diagnosis Matrix

The Grademy AI tutor diagnoses the specific IGCSE Chemistry gap that is costing the candidate marks toward the A*:

• Atomic-structure-recognition vs electron-configuration-mastery — if the candidate recognizes the atom structure but cannot write the electron-configuration in s-p-d-f-notation, the AI routes to electron-configuration drills.
• Periodic-table-recognition vs group-and-period-mastery — if the candidate recognizes the periodic-table but cannot identify group-1-alkali-metals + group-7-halogens + group-0-noble-gases + transition-metals + period-trends + group-trends, the AI routes to periodic-table drills.
• Ionic-vs-covalent-vs-metallic-bonding-recognition vs drawing-vs-properties-mastery — if the candidate recognizes the bonding-type but cannot draw the dot-and-cross-diagrams + state the properties + predict the structure, the AI routes to bonding-mastery drills.
• Stoichiometry-recognition vs mole-calculations-mastery — if the candidate recognizes the stoichiometry but cannot calculate moles + empirical-formula + molecular-formula + percentage-yield + atom-economy, the AI routes to mole-calculations drills.
• Acid-base-recognition vs pH-vs-neutralisation-mastery — if the candidate recognizes acids-bases but cannot calculate pH + write neutralisation-equations + predict salt-formation + select indicators, the AI routes to acid-base drills.
• Electrolysis-recognition vs electrode-product-prediction — if the candidate recognizes electrolysis but cannot predict the products-at-electrodes + calculate Faraday-constants + select electrolyte, the AI routes to electrolysis drills.
• Energetics-recognition vs energy-profile-drawing — if the candidate recognizes exothermic-endothermic but cannot draw energy-profile-diagrams + annotate activation-energy + calculate bond-energies + apply Hess-law, the AI routes to energetics drills.
• Rates-recognition vs rate-equation-vs-rate-curve-interpretation — if the candidate recognizes rate-of-reaction but cannot write the rate-equation + interpret the rate-curve + apply collision-theory + Boltzmann-distribution, the AI routes to rates drills.
• Equilibrium-recognition vs Le-Chatelier-prediction — if the candidate recognizes equilibrium but cannot predict Le-Chatelier-effect + calculate Kc + Kp + apply industrial-applications, the AI routes to equilibrium drills.
• Organic-chemistry-recognition vs functional-group-identification-vs-reaction-mastery — if the candidate recognizes organic-chemistry but cannot identify functional-groups + write addition-reactions + write substitution-reactions + write esterification + write fermentation + write cracking + write polymerisation, the AI routes to organic-chemistry drills.
• Chemical-tests-recognition vs anion-cation-gas-test-mastery — if the candidate recognizes chemical-tests but cannot recall test-for-chloride + test-for-sulfate + test-for-carbonate + test-for-ammonium + test-for-copper + test-for-iron + test-for-zinc + test-for-hydrogen + test-for-oxygen + test-for-carbon-dioxide + test-for-ammonia + test-for-chlorine + flame-tests, the AI routes to chemical-tests drills.
• Titration-recognition vs calculation-mastery — if the candidate recognizes titration but cannot calculate moles-at-equivalence + calculate concentration + select indicator + identify endpoint-vs-equivalence-point, the AI routes to titration drills.
• Mole-recognition vs empirical-formula-vs-molecular-formula-mastery — if the candidate recognizes moles but cannot calculate empirical-formula + molecular-formula + percentage-composition, the AI routes to mole-calculations drills.
• Observation-recognition vs qualitative-analysis-mastery — if the candidate recognizes observation but cannot identify anion + cation + gas + precipitate-formation + colour-changes + gas-evolution, the AI routes to qualitative-analysis drills.
• Measurement-recognition vs quantitative-analysis-mastery — if the candidate recognizes measurement but cannot calculate mass + volume + temperature + time + significant-figures + uncertainty + precision + accuracy, the AI routes to quantitative-analysis drills.

Section 9 — Pairs with IGCSE Biology 0610 (post-93) + IGCSE Physics 0625 (post-117) + IGCSE Co-ordinated Sciences 0654 (post-123) + IGCSE Mathematics 0580 (post-118) + IGCSE English Language 0500 (post-120) + IGCSE PE 0413 (post-133) + IGCSE Italian 0535 (post-136) + IGCSE German 0525 (post-135) + IGCSE Arabic 0544 (post-134) + IGCSE Spanish 0530 (post-132) + IGCSE French 0520 (post-131) + IGCSE Mandarin Chinese 0547 (post-130) + IGCSE Computer Science 0478 (post-129) + IGCSE ICT 0417 (post-128) + IGCSE Accounting 0452 (post-127) + IGCSE Business 0450 (post-126) + IGCSE Sociology 0250 (post-124) + IGCSE English Literature 0475 (post-125) + IGCSE Geography 0460 (post-122) + IGCSE History 0470 (post-121) + IGCSE Economics 0455 (post-119)

The IGCSE Chemistry 0620 playbook (post-137) sits in the IGCSE STEM + Chemistry cluster alongside IGCSE Biology 0610 (post-93) + IGCSE Physics 0625 (post-117) + IGCSE Co-ordinated Sciences 0654 (post-123) + IGCSE Mathematics 0580 (post-118) + IGCSE English Language 0500 (post-120) + IGCSE PE 0413 (post-133) + IGCSE Italian 0535 (post-136) + IGCSE German 0525 (post-135) + IGCSE Arabic 0544 (post-134) + IGCSE Spanish 0530 (post-132) + IGCSE French 0520 (post-131) + IGCSE Mandarin Chinese 0547 (post-130) + IGCSE Computer Science 0478 (post-129) + IGCSE ICT 0417 (post-128) + IGCSE Accounting 0452 (post-127) + IGCSE Business 0450 (post-126) + IGCSE Sociology 0250 (post-124) + IGCSE English Literature 0475 (post-125) + IGCSE Geography 0460 (post-122) + IGCSE History 0470 (post-121) + IGCSE Economics 0455 (post-119) for the international British-curriculum cohort targeting A-Level + IB + AP + STEM + Chemistry + Medicine + Dentistry + Pharmacy + Chemical-Engineering + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + US + Canadian + Australian + Singaporean + Hong-Kong admissions globally.

Pairs with IGCSE Music 0410 (post-138)

The IGCSE Chemistry 0620 playbook (post-137) + IGCSE Music 0410 playbook (post-138) form the IGCSE Sciences + Creative-Arts + Chemistry + Music + STEM pair for the international British-curriculum cohort. The 0620 atomic-structure + periodic-table + bonding + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates-of-reaction + equilibrium + Le-Chatelier + organic-chemistry + alkanes + alkenes + alcohols + carboxylic-acids + esters + polymers + chemical-tests + titrations + calculations + 14-topics + 21-sub-topics + 100+-equations + 200+-reactions + 100+-vocabulary + 50+-calculation-types toolkit — particularly the chemistry-relevant sections on acoustics-of-instruments + chemistry-of-sound + chemistry-of-recording + chemistry-of-electronic-music + chemistry-of-polymer-instruments + chemistry-of-string-instruments + chemistry-of-bowing-resins + chemistry-of-brass-instruments + chemistry-of-reed-instruments + chemistry-of-percussion-instrument-materials + chemistry-of-microphone-materials — sits alongside the 0410 Western-Classical-Tradition + World-Music + Popular-Music + Set-Works + Music-in-the-20th-and-21st-Century + 25 sub-topics + melody + harmony + rhythm + texture + timbre + dynamics + notation + score-reading + theory-toolkit + performance-toolkit + composition-toolkit + aural-skills + Component-1-Listening + Component-2-Performing + Component-3-Composing toolkit. Grademy AI tutor holds both specs in working memory for A-Level Chemistry + A-Level Music + IB Chemistry HL + IB Chemistry SL + IB Music + AP Chemistry + AP Music Theory + A-Level Chemistry + A-Level Music + Creative-Arts + Performing-Arts + Medicine + Dentistry + Pharmacy + Pharmacology + Engineering + Chemical-Engineering + Materials-Science + Nanotechnology + Physics + Chemistry + Biology + Chemical-Biology + Molecular-Biology + Biochemistry + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + Royal-Academy + Royal-College + Trinity-Laban + GSMD + RNCM + RSAMD + Birmingham-Conservatoire + Royal-Irish + Bimm-London + Berklee + Juilliard + US + Canadian + Australian + Singaporean + Hong-Kong + Global admissions.

Pairs with IGCSE Drama 0411 (post-139)

The IGCSE Chemistry 0620 playbook (post-137) + IGCSE Drama 0411 playbook (post-139) form the IGCSE Sciences + Performing-Arts + Chemistry + Drama pair for the international British-curriculum cohort. The 0620 atomic-structure + periodic-table + bonding + stoichiometry + moles + acids-bases-salts + electrochemistry + electrolysis + energetics + rates + equilibrium + organic-chemistry + chemical-tests + calculations-titrations + 14-topics + 21-sub-topics + 100+-equations + 200+-reactions + 100+-vocabulary + 50+-calculation-types toolkit — particularly the drama-relevant sections on chemistry-of-stage-fog + chemistry-of-stage-pyrotechnics + chemistry-of-stage-make-up + chemistry-of-costume-dyeing + chemistry-of-costume-fabric + chemistry-of-set-paint + chemistry-of-set-finishes + chemistry-of-stage-lighting + chemistry-of-stage-smoke + chemistry-of-stage-fire + chemistry-of-set-effects — sits alongside the 0411 3-Components + Written-Examination + Practical-Performance + Practical-Coursework + devising + performing + responding + theatre-makers + dramatic-techniques + vocal-skills + physical-skills + performance-practice + written-analysis + set-text-analysis + theatrical-styles + 10-topics + 25-sub-topics + 30+-dramatic-techniques + 30+-theatrical-styles + 50+-vocabulary + 25+-methodologies toolkit. Grademy AI tutor holds both specs in working memory for A-Level Chemistry + A-Level Drama + IB Chemistry HL + IB Chemistry SL + IB Theatre + AP Chemistry + AP Theatre Arts + A-Level Drama + A-Level Chemistry + Creative-Arts + Performing-Arts + Chemistry + Medicine + Dentistry + Pharmacy + Pharmacology + Engineering + Chemical-Engineering + Materials-Science + Nanotechnology + Physics + Chemistry + Biology + Chemical-Biology + Molecular-Biology + Biochemistry + Drama + Theatre + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + RADA + LAMDA + Guildhall + Central + Bristol-Old-Vic + Mountview + Rose-Bruford + East-15 + Arts-Ed + Italia-Conti + US + Canadian + Australian + Singaporean + Hong-Kong + Global admissions.

Pairs with IGCSE Art and Design 0400 (post-146)

The IGCSE Chemistry 0620 playbook (post-137) + IGCSE Art and Design 0400 playbook (post-146) form the IGCSE Chemistry + Materials-Science + Pigments + Glazes + Conservation + Restoration pair for the international British-curriculum cohort. The 0620 atomic-structure + periodic-table + bonding + stoichiometry + acids-and-bases + salts + electrolysis + metals + non-metals + organic-chemistry + rates-of-reaction + energetics + equilibrium + redox + analysis toolkit — particularly the art-and-design-relevant sections on pigments + dyes + paints + inks + glazes + ceramics-glazes + glass + metals + alloys + patination + conservation-chemistry + restoration-chemistry + preservation-chemistry + material-degradation + oxidation + reduction + pH + acid-etching + base-etching + solvent-action + photographic-chemistry + darkroom-chemistry + film-development + print-fixing + colour-chemistry + dye-chemistry + textile-dyeing + batik-chemistry + resist-chemistry + mordant-chemistry + indigo-chemistry + pigment-binders + acrylic-polymer + oil-polymer + emulsion-chemistry + gouache-chemistry + watercolour-chemistry + encaustic-chemistry + fresco-chemistry + tempera-chemistry + ceramic-glaze-chemistry + glaze-chemistry + kiln-chemistry + firing-chemistry — sits alongside the 0400 6-modules + 30-sub-topics + 80+-art-concepts + 50+-materials + 40+-processes + 30+-techniques + 30-practical-tools + 10-theory-concepts + 50-AI-tutor-prompts toolkit as the dominant IGCSE Chemistry + Materials-Science + Pigments + Glazes + Conservation pair. Grademy AI tutor holds both specs in working memory for A-Level-Chemistry + A-Level-Art + A-Level-Fine-Art + A-Level-Graphic-Design + A-Level-Textiles + A-Level-Materials-Science + A-Level-Architecture + IB-Chemistry + IB-Art + IB-Design-Technology + IB-Visual-Arts + BTEC-Applied-Science + BTEC-Art + BTEC-Design + Russell-Group + Oxbridge + Imperial + UCL + Warwick + Cambridge + Bristol + Durham + Manchester + Edinburgh + Loughborough + Bath + Exeter + Birmingham + Leeds + Liverpool + Cardiff + Met + RCA + Royal-College-of-Art + Central-Saint-Martins + CSM + Goldsmiths + Slade + Glasgow-School-of-Art + Edinburgh-College-of-Art + ECA + Courtauld-Institute-of-Art + Hamilton-Kerr-Institute + Cambridge-Conservation + UCL-Institute-of-Archaeology + MIT + Stanford + Carnegie-Mellon + Georgia-Tech + Caltech + Berkeley + US + Canadian + Australian + Singaporean + Hong-Kong + Global admissions.