Edexcel Chemistry Unit 4 Past Papers
IA2 • WCH14/01
Quantitative kinetics, entropy and Gibbs energy, equilibrium constants and acid–base equilibria, plus further organic chemistry of carbonyls, carboxylic acids and chirality.
Every Unit 4 question paper we hold, from 2019 to 2026, with its mark scheme and examiner report where available. Open any PDF in a new tab, or work through the topics below before you sit a full paper.
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What Unit 4 covers
- Topic 11: Kinetics
Rate equations, order of reaction, rate-determining step, Arrhenius equation and heterogeneous catalysis.
- Topic 12: Entropy and Energetics
Entropy changes, total entropy and feasibility; lattice energies, Born–Haber cycles and enthalpies of solution.
- Topic 13: Chemical Equilibria
Equilibrium constants Kc and Kp, calculations and the effect of changing conditions on equilibrium position.
- Topic 14: Acid–base Equilibria
Brønsted–Lowry theory, pH, Ka and Kw, strong/weak acids and bases, buffers, indicators and titration curves.
- Topic 15: Organic Chemistry: Carbonyls, Carboxylic Acids and Chirality
Aldehydes and ketones, carboxylic acids, esters, acyl chlorides, optical isomerism and reaction pathways.