OCR B A-level Chemistry Year 12 revision

Topic 1: Development of practical skills in chemistry

It builds on what you learned at GCSE in Ideas about science and practical skills, and takes it further.

There are 11 parts: we start with planning investigations, and finish with graphs.

1. 1.1Planning investigations: variables, hypotheses and choosing apparatus and techniquesFree 39 questions
2. 1.2Safe working: hazards, risk assessment and environmental and ethical considerations30 questions
3. 1.3Using apparatus accurately: balances, burettes, pipettes, volumetric flasks, gas syringes and thermometers74 questions
4. 1.4Basic techniques: heating, filtration, drying and heating to constant mass74 questions
5. 1.5Measurement uncertainty, percentage error and improving precision33 questions
6. 1.6Recording, presenting and evaluating results: tables, graphs, anomalies and conclusions34 questions
7. 1.7Using ICT and data loggers, researching and referencing sources41 questions
8. 1.8Arithmetic: standard form, significant figures, unit conversions and estimationFree 16 questions
9. 1.9Ratios, fractions, percentages and proportionality in chemical calculations26 questions
10. 1.10Algebra: rearranging and substituting into equations (n = m/M, c = n/V, pV = nRT, Kc)40 questions
11. 1.11Graphs: plotting, line of best fit, gradients, tangents and intercepts34 questions

Topic EL: Elements of life

It builds on what you learned at GCSE in Chemical patterns and Chemical analysis, and takes it further.

There are 13 parts: we start with atomic structure, and finish with qualitative analysis.

1. EL.1Atomic structureFree 55 questions
2. EL.2Development of models of the atom and evidence for atomic structure60 questions
3. EL.3Amount of substance61 questions
4. EL.4Writing formulae of ions and compounds, balanced equations, state symbols and ionic equations45 questions
5. EL.5Molar gas volume and gas volume calculations62 questions
6. EL.6Hydrated salts, water of crystallisation and percentage composition70 questions
7. EL.7Practical: preparing a standard solution and carrying out an acid-base titrationFree 67 questions
8. EL.8Ionic and metallic bonding, and how structure affects physical properties23 questions
9. EL.9BondingFree 38 questions
10. EL.10Geometry: bond angles, 3D molecular shapes and drawing molecules66 questions
11. EL.11PeriodicityFree 17 questions
12. EL.12Group 2, the alkaline earth metals29 questions
13. EL.13Qualitative analysis: flame tests and tests for carbonate, sulfate, halide, hydroxide and ammonium ions71 questions

Topic DF: Developing fuels

It builds on what you learned at GCSE in Making useful chemicals and Chemicals of the natural environment, and takes it further.

There are 8 parts: we start with energetics, and finish with the practical on investigating rates of reaction by gas collection, clock reactions and continuous monitoring.

1. DF.1Energetics64 questions
2. DF.2Practical: measuring enthalpy changes by calorimetry (neutralisation, displacement, solution and combustion)65 questions
3. DF.3Crude oil, fractional distillation, fuels and pollution from combustion20 questions
4. DF.4Introduction to organic chemistryFree 26 questions
5. DF.5Alkanes30 questions
6. DF.6AlkenesFree 25 questions
7. DF.7Kinetics67 questions
8. DF.8Practical: investigating rates of reaction by gas collection, clock reactions and continuous monitoring72 questions

Topic ES: Elements from the sea

It builds on what you learned at GCSE in Chemical patterns, and takes it further.

There are 5 parts: we start with group 7, the halogens, and finish with the practical on measuring the molar volume of a gas and determining moles from reacting masses.

1. ES.1Group 7, the halogens13 questions
2. ES.2Oxidation, reduction and redox equations54 questions
3. ES.3Chemical equilibria and KcFree 27 questions
4. ES.4Acids, bases, salts and neutralisation63 questions
5. ES.5Practical: measuring the molar volume of a gas and determining moles from reacting masses66 questions

Topic OZ: The ozone story

It builds on what you learned at GCSE in Air and water, and takes it further.

There are 3 parts: we start with halogenoalkanes, and finish with infrared absorption, bond vibrations and the greenhouse effect.

1. OZ.1Halogenoalkanes32 questions
2. OZ.2Ozone depletion by CFCs and radical chain reactions in the atmosphere30 questions
3. OZ.3Infrared absorption, bond vibrations and the greenhouse effect16 questions

Topic WM: What's in a medicine?

It builds on what you learned at GCSE in Chemical analysis, and takes it further.

There are 5 parts: we start with alcohols, and finish with organic synthesis.

1. WM.1Alcohols25 questions
2. WM.2Practical: preparing an organic liquid by heating under reflux and distillation (e.g. oxidation of an alcohol)62 questions
3. WM.3Practical: purifying an organic liquid using a separating funnel, drying agent and redistillation34 questions
4. WM.4Organic analysis59 questions
5. WM.5Organic synthesis: reaction pathways and multi-step routes between functional groups21 questions

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