AQA and OCR A
A-level chemistry calculations
Pick the calculation you want to practise.
Need practice with significant figures or powers of ten? Open maths skills for chemistry.
GCSE Chemistry? Start with GCSE calculations (AQA or Edexcel) →
Mixed exam calculations
Unfamiliar questions need you to decide what to calculate before you start. Practise a mixture of short and extended moles and stoichiometry questions, with help when you need it.
Try mixed exam calculationsStart here
Mixed exam calculationsUnfamiliar wording, mixtures, formulae and multi-stage problems
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Moles & amount of substanceStoichiometry, gases, formulae and yield
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Titration questionsCalculations, results and practical skills
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Back titrationAcid–base and redox
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Acid–base calculationsAQA and OCR A Year 13
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Isotopes & mass spectrometryAᵣ, abundance, spectra and hard algebra
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TOF mass spectrometryAQA Year 12
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Ideal gas equationPV = nRT
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Rates
KineticsRate evidence, Arrhenius and Maxwell–Boltzmann
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Kinetics exam setsLinked rate, Arrhenius and explanation questions
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Rate equation questionsOrders, k and units
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Rate Order DetectiveOrders from evidence
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Arrhenius equation & plotsk, Ea, ln k against 1/T and OCR A intercepts
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Boltzmann questions & simulatorTemperature, catalysts and exam graphs
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Equilibrium and energetics
EquilibriumKc, Kp, partial pressure and equilibrium response
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Kc & Kp calculationsLinked calculations with diagnostic feedback
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Kc & Qc simulatorExpressions and equilibrium response
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Hess lawYear 12 cycles and enthalpy calculations
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ThermodynamicsYear 13 entropy, Gibbs and ionic energetics
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Born–Haber cyclesYear 13 / full A-level only
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Lattice, hydration & solutionYear 13 ionic energetics
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Bond enthalpy questionsCount bonds, estimate ΔH and find missing bond enthalpies
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