OCR A-level Chemistry, one topic at a time
1,820 question parts from 47 OCR Chemistry A papers from June 2016 to June 2025, sorted by topic, with the mark scheme and the examiner's comment one tap away. Free, no sign-up.
OCR A-level H432 and AS H032 (Chemistry A). Modules 1 to 4 are the AS content; Modules 5 and 6 are A-level only. The June 2026 papers will be added when OCR makes them public.
Most-examined topics
- Amount of substance (moles)M2 291 parts
- Organic basics: naming, formulae and isomerismM4 181 parts
- AlkenesM4 139 parts
- Bonding, structure and shapes of moleculesM2 125 parts
- Formulae and equationsM2 111 parts
- Enthalpy changes and Hess’ lawM3 99 parts
- Acids, bases and titrationsM2 90 parts
- Redox and oxidation numbersM2 78 parts
- Periodicity and ionisation energyM3 74 parts
- Acids, bases, pH and buffersM5 69 parts
- Redox titrations and electrode potentialsM5 74 parts
- Transition elementsM5 78 parts
- Rates: orders, rate equations and the Arrhenius equationM5 46 parts
- Aromatic compounds: benzene and phenolM6 55 parts
- Carboxylic acids, esters and acyl chloridesM6 59 parts
- NMR spectroscopy and combined techniquesM6 38 parts
Everything on the site
Past papersEvery H432 and H032 paper since 2016 with a question-by-question table, mark schemes and examiners' comments PracticeReal questions one at a time; instant marking on multiple choice, self-marking on the rest CalculationsEvery calculation question, sorted by the maths skills in the specification MechanismsEvery curly-arrow question with the mark scheme's mechanism, and what each arrow must show PracticalsPractical questions by PAG: titrations, enthalpy, rates, tests for ions, organic synthesis Six-mark questionsEvery level of response question set, by topic, with a timed practice tool Data SheetWhat OCR gives you in the exam, and the equations you have to learn Mini-mock builderA paper-shaped timed mock from real questions: Paper 1, 2 or 3 Spec checklistEvery learning outcome of the specification, tickable, linked to its questions What comes upMarks by topic since 2017, the latest papers, every paper as a timeline Boundaries and datesGrade calculator and the 2027 exam dates with a countdown Your tutorOnline one-to-one lessons with a specialist OCR chemistry tutor
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