OCR B GCSE Chemistry revision

Topic C1: Air and water

There are 8 parts: we start with evolution of the Earth's atmosphere, and finish with molar volume and calculations involving gases.

1. C1.1Evolution of the Earth's atmosphere27 questions
2. C1.2The atmosphere and climate changeFree 23 questions
3. C1.3Carbon footprint and reducing greenhouse gas emissions68 questions
4. C1.4Atmospheric pollutants19 questions
5. C1.5Earth's resources and potable waterFree 27 questions
6. C1.6Required practical: analysis and purification of water samples65 questions
7. C1.7States of matter, the particle model and changes of state70 questions
8. C1.8Molar volume and calculations involving gases56 questions

Topic C2: Chemical patterns

There are 10 parts: we start with development of the model of the atom (Dalton to Bohr and Chadwick), and finish with ionic, covalent and metallic bonding.

1. C2.1Development of the model of the atom (Dalton to Bohr and Chadwick)66 questions
2. C2.2Atoms, elements and isotopesFree 58 questions
3. C2.3Relative atomic mass and isotopic abundance31 questions
4. C2.4Electronic structure and electron configurations66 questions
5. C2.5Development of the periodic table and metals versus non-metals71 questions
6. C2.6The periodic table and groups67 questions
7. C2.7Group 1: the alkali metals and their reactions35 questions
8. C2.8Groups 7 and 0: the halogens, displacement reactions and the noble gases60 questions
9. C2.9Transition metals: properties and uses22 questions
10. C2.10Ionic, covalent and metallic bondingFree 21 questions

Topic C3: Chemicals of the natural environment

There are 8 parts: we start with reactivity of metals and extraction, and finish with cracking of hydrocarbons.

1. C3.1Reactivity of metals and extractionFree 25 questions
2. C3.2Oxidation and reduction (redox) in terms of oxygen, electrons and displacement59 questions
3. C3.3Sustainable metal extraction: bioleaching, phytomining and recycling metals26 questions
4. C3.4Acids, bases and electrolysis37 questions
5. C3.5Required practical: electrolysis of aqueous solutions64 questions
6. C3.6Structures and properties of materials25 questions
7. C3.7Crude oil and hydrocarbonsFree 26 questions
8. C3.8Cracking of hydrocarbons: catalytic and steam cracking22 questions

Topic C4: Material choices

There are 7 parts: we start with alkenes, alcohols and polymers, and finish with life cycle assessment and recycling.

1. C4.1Alkenes, alcohols and polymers26 questions
2. C4.2Condensation polymerisation (polyesters and polyamides)32 questions
3. C4.3Naturally occurring polymers: amino acids, proteins, DNA, starch and cellulose51 questions
4. C4.4Nanoparticles: properties, uses and risks20 questions
5. C4.5Alloys, ceramics, composites and polymers as materials47 questions
6. C4.6Corrosion, rusting and its prevention31 questions
7. C4.7Life cycle assessment and recycling20 questions

Topic C5: Chemical analysis

There are 12 parts: we start with mixtures and separation techniques (filtration, crystallisation, simple and fractional distillation), and finish with the practical on acid–alkali titration and titration calculations.

1. C5.1Mixtures and separation techniques (filtration, crystallisation, simple and fractional distillation)77 questions
2. C5.2Purity, formulations and chromatographyFree 63 questions
3. C5.3Required practical: paper chromatography, Rf values and analysis of inks65 questions
4. C5.4Identifying gases and ions65 questions
5. C5.5Required practical: identifying unknown ions (flame tests, precipitates, anion tests)24 questions
6. C5.6Instrumental methods and flame emission spectroscopy24 questions
7. C5.7Conservation of mass and the moleFree 59 questions
8. C5.8Relative formula mass, percentage composition and empirical and molecular formulae47 questions
9. C5.9Writing and balancing chemical equations, state symbols and ionic equations43 questions
10. C5.10Reacting masses, concentration and yield62 questions
11. C5.11Limiting reactants and using moles to balance equations52 questions
12. C5.12Required practical: acid–alkali titration and titration calculations58 questions

Topic C6: Making useful chemicals

There are 16 parts: we start with strong and weak acids, pH and hydrogen ion concentration, and finish with carboxylic acids and esters.

1. C6.1Strong and weak acids, pH and hydrogen ion concentration51 questions
2. C6.2Solubility rules and precipitation reactions21 questions
3. C6.3Required practical: preparing a pure, dry sample of a soluble salt21 questions
4. C6.4Exothermic and endothermic reactionsFree 57 questions
5. C6.5Reaction profiles, activation energy and bond energy calculations54 questions
6. C6.6Required practical: investigating temperature changes in reacting solutions59 questions
7. C6.7Cells and fuel cells22 questions
8. C6.8Rates of reactionFree 63 questions
9. C6.9Calculating rates of reaction: mean rates and tangents on graphs62 questions
10. C6.10Required practical: rate of reaction by gas volume or mass loss66 questions
11. C6.11Required practical: rate of reaction by turbidity (sodium thiosulfate and hydrochloric acid)53 questions
12. C6.12Reversible reactions and equilibrium19 questions
13. C6.13The Haber process and choosing industrial conditions62 questions
14. C6.14Fertilisers and NPK compounds29 questions
15. C6.15Atom economy56 questions
16. C6.16Carboxylic acids and esters34 questions

Topic S: Ideas about science and practical skills

There are 6 parts: we start with models, theories and evidence in chemistry, and finish with chemistry calculations.

1. S.1Models, theories and evidence in chemistryFree 25 questions
2. S.2Planning investigations: variables, hypotheses and risk assessment37 questions
3. S.3Practical techniques and apparatus (measuring, heating, gas collection, safety)73 questions
4. S.4Presenting data: tables, graphs, significant figures and standard form28 questions
5. S.5Uncertainty, accuracy, precision, repeatability and evaluating results36 questions
6. S.6Chemistry calculations: ratios, percentages, unit conversions and rearranging equations44 questions

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