Questions by topic

Every OCR AS and A-level Chemistry A past-paper question since June 2016, sorted into the topics of the six modules. Each topic page shows every question with its mark scheme and the examiner's comment, with filters by paper, year and question type. Paper 3 (Unified chemistry) questions appear under whichever topic they assess.

Module 1: Development of practical skills (AS and A level, all papers)

• Practical skills: planning, analysis and evaluationM1 96 parts
• Practical techniques and apparatus (PAGs)M1 42 parts

Module 2: Foundations in chemistry (AS and A level, all papers)

• Atomic structure and isotopesM2 62 parts
• Formulae and equationsM2 111 parts
• Amount of substance (moles)M2 291 parts
• Acids, bases and titrationsM2 90 parts
• Redox and oxidation numbersM2 78 parts
• Electron structure and orbitalsM2 32 parts
• Bonding, structure and shapes of moleculesM2 125 parts

Module 3: Periodic table and energy (AS and A level; A-level Papers 1 and 3)

• Periodicity and ionisation energyM3 74 parts
• Group 2M3 34 parts
• The halogensM3 61 parts
• Qualitative analysis: tests for ionsM3 25 parts
• Enthalpy changes and Hess’ lawM3 99 parts
• Reaction rates and the Boltzmann distributionM3 60 parts
• Chemical equilibrium and KcM3 57 parts

Module 4: Core organic chemistry (AS and A level; A-level Papers 2 and 3)

• Organic basics: naming, formulae and isomerismM4 181 parts
• AlkanesM4 69 parts
• AlkenesM4 139 parts
• AlcoholsM4 75 parts
• HaloalkanesM4 56 parts
• Organic synthesis and practical techniques (Module 4)M4 27 parts
• Infrared spectroscopy and mass spectrometryM4 61 parts

Module 5: Physical chemistry and transition elements (A level only; Papers 1 and 3)

• Rates: orders, rate equations and the Arrhenius equationM5 46 parts
• Equilibrium constants Kc and KpM5 45 parts
• Acids, bases, pH and buffersM5 69 parts
• Lattice enthalpy and Born–Haber cyclesM5 27 parts
• Entropy and free energyM5 25 parts
• Redox titrations and electrode potentialsM5 74 parts
• Transition elementsM5 78 parts

Module 6: Organic chemistry and analysis (A level only; Papers 2 and 3)

• Aromatic compounds: benzene and phenolM6 55 parts
• Carbonyl compounds: aldehydes and ketonesM6 33 parts
• Carboxylic acids, esters and acyl chloridesM6 59 parts
• AminesM6 17 parts
• Amino acids, amides and chiralityM6 50 parts
• Polyesters and polyamidesM6 26 parts
• Carbon–carbon bond formationM6 27 parts
• Organic synthesis (Module 6)M6 56 parts
• Chromatography and tests for functional groupsM6 31 parts
• NMR spectroscopy and combined techniquesM6 38 parts

By question type

Or work on a kind of question across every topic: multiple choice, calculations, equations, mechanisms, structures and isomers, six-mark level of response, practical questions, short answers.