Assessment and exam practice.

Try this with Chemistry

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2. Start with one timed section or task and record where you spent the most time.
3. Review errors before attempting another section. Separate missing knowledge from timing problems.

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Practice paper focus areas

• Exam 1 — Chemical equilibrium: writing Kc expressions, calculating Kc from equilibrium concentrations and ICE tables, and interpreting the magnitude of Kc; Le Chatelier's Principle applied to concentration, pressure, volume and temperature changes in the Haber process, with collision-theory reasoning; Bronsted-Lowry acid-base theory, conjugate pairs, pH/pOH calculations for strong and weak acids/bases, Ka, and buffer behaviour (Henderson-Hasselbalch)
• Exam 2 — Carbonate equilibria in seawater: Kc expressions, Qc vs Kc, and Le Chatelier reasoning for rising atmospheric CO2; Bronsted-Lowry acid-base theory: conjugate pairs, Ka1/Ka2 of carbonic acid, pH/pOH and the bicarbonate buffer; Quantitative acid-base chemistry: weak-acid pH, dilution, strong-acid/base pH, Henderson-Hasselbalch
• Exam 3 — Unit 3: chemical equilibrium (Kc, Le Chatelier) applied to chlorine/HOCl systems; Unit 3: Bronsted-Lowry acid-base theory, pH/pOH, Ka/Kb, buffer solutions (HOCl/OCl- pool buffering); Unit 3: volumetric analysis - acid-base titration of pool dosing acids/bases with full stoichiometry
• Exam 4 — Volumetric analysis: back-titration determination of ethanoic acid in commercial vinegar (n=cV, dilution scaling, excess-reagent logic); Acid-base equilibrium: Bronsted-Lowry conjugate pairs, weak-acid pH, Ka/pKa, Kw and pOH; Titration-curve interpretation: half-equivalence (pH = pKa), equivalence-point pH for weak acid + strong base, indicator selection
• Exam 5 — QCAA Chemistry Units 3 & 4 External Assessment (50% of subject result), simulated across Paper 1 (Section A: 20 MC + Section B: 8 short-response, 38 marks) and Paper 2 (Section C: 8 short/extended-response, 52 marks) for a grand total of 110 marks; Unit 3 Topic 2 redox and electrochemistry anchored on the stimulus context: silver electroplating of a copper bracelet in a AgNO3 electrolytic cell - half-equations, anode/cathode identification, ion movement, Faraday's-law mass calculations, E°cell, and galvanic vs electrolytic distinction; Unit 3 Topic 1 chemical equilibrium: Kc expressions and calculations, ICE tables, Le Chatelier's Principle (concentration/pressure/temperature) explained through collision theory
• Exam 6 — Unit 3 Redox: oxidation-state assignment, half-equation balancing, combining half-equations for full redox, oxidising/reducing agent identification; Unit 3 Electrochemistry: galvanic vs electrolytic cells, standard electrode potentials E°, E°cell, spontaneity, Faraday's laws (Q=It, n=Q/zF), industrial electrolytic refining of copper and the anode-sludge/anode-impurity rationale; Unit 3 Equilibrium: Kc expressions and calculations, ICE tables, Le Chatelier's Principle (concentration, pressure, temperature) with collision-theory reasoning
• Exam 7 — Unit 3 redox: standard reduction potentials, galvanic cell EMF, spontaneity and reducing-agent strength (galvanic-corrosion / sacrificial-anode context); Unit 3 redox: oxidation-state assignment, half-equation balancing, electrolytic cells and Faraday's law; Unit 3 equilibrium: Kc expressions and calculations, ICE tables, Le Chatelier's Principle (concentration/pressure/temperature)
• Exam 8 — Unit 3 Topic 2 (Oxidation and reduction): standard electrode potentials, E°cell calculation, ranking oxidising/reducing agent strength, galvanic cell construction and labelling, electrolysis - anchored to a rechargeable-battery electrode-pair design context; Unit 3 Topic 1 (Equilibrium, acids and redox): Kc expression and ICE-table calculations, Le Chatelier's Principle via collision theory, Bronsted-Lowry theory, pH/pOH/Ka/Kb, weak-acid and buffer calculations, acid-base titration analysis and indicator selection; Unit 4 Topic 1 (Structure of organic materials): the 12 hydrocarbon-derivative classes, IUPAC nomenclature, structural and cis-trans isomerism, intermolecular forces and physical-property trends, polymers, proteins, carbohydrates and lipids
• Exam 9 — Unit 4 industrial synthesis — biodiesel production from waste vegetable oil by base-catalysed transesterification with methanol (the stimulus context anchoring the paper); Unit 4 organic structure — esters, the 12 hydrocarbon-derivative classes, IUPAC naming, isomerism, IMF-based physical properties, and triglyceride/lipid macromolecules; Unit 4 organic reactions — esterification/transesterification, combustion, addition (Markovnikov), oxidation of alcohols, nucleophilic substitution, elimination, and multi-step synthesis pathways
• Exam 10 — Unit 3 Chemical Equilibrium: Kc expressions and calculations, ICE tables, Le Chatelier's Principle (concentration/pressure/temperature), collision-theory mechanisms; Unit 3 Acids: Bronsted-Lowry theory, conjugate pairs, pH/pOH, Kw, Ka/Kb, weak-acid and weak-base calculations, buffers, acid-base titration analysis and indicator selection; Unit 3 Redox: oxidation-state assignment, half-equation balancing, galvanic vs electrolytic cells, standard electrode potentials and E°cell, spontaneity, electroplating and aluminium production
• Exam 11 — Organic synthesis & esterification (aspirin: salicylic acid -> acetylsalicylic acid); Reaction-type identification, balanced equations & reaction conditions; Atom economy & green chemistry evaluation
• Exam 12 — QCAA Chemistry Units 3 & 4 (General Senior Syllabus 2025 v1.3) full External Assessment, contextualised on the comparison of polylactic acid (PLA) with polyethylene (PE) in biodegradable packaging; Paper 1 Section A: 20 single-best-answer multiple-choice (1 mark each) spanning equilibrium/Kc, Le Chatelier, Bronsted-Lowry acid-base, pH/pOH/Ka, redox oxidation states and E°cell, organic structure/IUPAC naming/isomerism, addition vs condensation polymers, and stoichiometry; Paper 1 Section B: 8 short/extended-response questions (38 marks) on dynamic equilibrium and Kc, weak-acid pH from Ka, acid-base titration and standardisation, redox half-equations and galvanic cells, organic nomenclature and intermolecular forces, condensation vs addition polymerisation mechanisms
• Exam 13 — Unit 3: chemical equilibrium (Kc, Le Chatelier, reaction quotient) applied to esterification and industrial systems; Unit 3: Bronsted-Lowry acid-base theory, pH/pOH, Ka, weak-acid dissociation and buffer calculations; Unit 3: volumetric analysis - monoprotic and diprotic acid-base titrations with concordant titres
• Exam 14 — Markovnikov addition and acid-catalysed hydration of unsymmetrical alkenes (regioselectivity via carbocation stability); IUPAC nomenclature, isomerism and structure of the 12 hydrocarbon-derivative classes; Six core organic reactions: combustion, nucleophilic substitution, elimination, addition, oxidation, esterification
• Exam 15 — Multi-step organic synthesis pathway design from an alkane to an ester fragrance compound (reaction-type, reagent and condition selection at each step); Six core organic reaction types: combustion, free-radical/nucleophilic substitution, elimination, addition (Markovnikov), oxidation, esterification; Organic structure, IUPAC nomenclature, isomerism and intermolecular-force-based physical property trends across hydrocarbon derivative classes
• Exam 16 — Chemical equilibrium: Kc expressions, ICE tables and Le Chatelier applied to the contact process (SO2 oxidation over V2O5) as a yield-vs-rate compromise; Bronsted-Lowry acid-base theory: pH/pOH, strong vs weak acids/bases, Ka/Kb, buffers and acid-base titration stoichiometry; Oxidation-reduction: oxidation states, half-equations, galvanic cell EMF from standard electrode potentials, and electrolysis (Faraday's laws, electroplating, aluminium)
• Exam 17 — Unit 3 — Chemical equilibrium: Kc expressions and ICE calculations, Le Chatelier (concentration/pressure/temperature) and collision-theory mechanism; Unit 3 — Acids and bases: Bronsted-Lowry conjugate pairs, strong/weak distinction, pH/pOH, Ka/Kb, buffers and Henderson-Hasselbalch, acid-base titration and indicator choice; Unit 3 — Redox and electrochemistry: oxidation-state assignment, half-equation balancing in acid, galvanic cell labelling and E°cell, ranking oxidising/reducing agents, electrolysis and Faraday stoichiometry, aluminium/copper industrial cells
• Exam 18 — QCAA Chemistry Units 3 & 4 (2025 v1.3) full External Assessment; Stimulus context: nylon-6,6 condensation polymerisation from hexanedioic acid + 1,6-diaminohexane, amide bond, contrast with addition polymerisation; Unit 3: chemical equilibrium (Kc, ICE tables, Le Chatelier, collision theory)
• Exam 19 — Unit 3 Topic 2 Oxidation & Reduction anchored on the permanganate-iron(II) redox titration for water-quality testing (half-equation balancing in acidic conditions, MnO4-/Fe2+ 1:5 stoichiometry, oxidising/reducing agent identification, self-indicating endpoint, E°cell); Unit 3 Topic 1 Equilibrium, Acids & Redox: Kc expressions and ICE calculations, Le Chatelier's Principle via collision theory, Brønsted-Lowry conjugate pairs, pH/pOH, weak-acid Ka and percent ionisation, buffers, volumetric analysis and titration-curve interpretation; Unit 4 Topic 1 Properties & Structure of Organic Materials: IUPAC nomenclature of the 12 derivative classes, structural and cis-trans isomerism, intermolecular forces explaining physical-property trends, addition/condensation polymers and proteins
• Exam 20 — Unit 3 Equilibrium: Kc expressions, Le Chatelier (concentration/pressure/temperature); Unit 3 Acids & bases: Bronsted-Lowry, pH/pOH, Ka/Kb, weak vs strong; Buffer chemistry: composition, mechanism, Henderson-Hasselbalch, pH change on acid/base addition (pharmaceutical formulation context)