OCR B A-level Chemistry Year 13 revision

Topic CI: The chemical industry

It builds on what you learned at AS in Elements from the sea and Developing fuels, and takes it further.

There are 5 parts: we start with rate equations, and finish with equilibrium constant Kp.

1. CI.1Rate equations63 questions
2. CI.2Half-life of first-order reactions and concentration–time graphs73 questions
3. CI.3Practical: measuring reaction rates by initial-rate and continuous-monitoring methods (including iodine–propanone and clock reactions)Free 78 questions
4. CI.4Equilibrium constant Kc: expressions, units, calculations and the effect of temperature64 questions
5. CI.5Equilibrium constant Kp15 questions

Topic PL: Polymers and life

It builds on what you learned at AS in What's in a medicine?, and takes it further.

There are 9 parts: we start with polymers, and finish with the practical on preparing a pure organic solid (e.g. aspirin), recrystallisation and melting-point purity test.

1. PL.1Polymers28 questions
2. PL.2Amino acids, proteins and DNA41 questions
3. PL.3Optical isomerismFree 23 questions
4. PL.4Carboxylic acids and derivatives41 questions
5. PL.5Amines16 questions
6. PL.6Nuclear magnetic resonance spectroscopy64 questions
7. PL.7Combined structure determination using mass spectrometry, IR, 13C and 1H NMR data39 questions
8. PL.8Organic synthesisFree 23 questions
9. PL.9Practical: preparing a pure organic solid (e.g. aspirin), recrystallisation and melting-point purity test82 questions

Topic O: Oceans

It builds on what you learned at AS in Elements from the sea, and takes it further.

There are 4 parts: we start with acids, bases and buffers, and finish with thermodynamics.

1. O.1Acids, bases and buffers38 questions
2. O.2Practical: pH curves, determining Ka of a weak acid and making and testing buffers46 questions
3. O.3Enthalpy change of neutralisation: strong and weak acids63 questions
4. O.4ThermodynamicsFree 28 questions

Topic DM: Developing metals

It builds on what you learned at AS in Elements from the sea, and takes it further.

There are 8 parts: we start with transition metals, and finish with the practical on measuring the EMF of electrochemical cells and testing electrode potential predictions.

1. DM.1Transition metals23 questions
2. DM.2Reactions of ions in aqueous solution58 questions
3. DM.3Redox titrations: manganate(VII), dichromate(VI) and iodine–thiosulfate calculations76 questions
4. DM.4Colorimetry and visible spectroscopy: determining the concentration and formula of complex ions68 questions
5. DM.5Practical: test-tube reactions of transition metal ions (precipitation, ligand exchange, redox)30 questions
6. DM.6Practical: preparation of a transition metal complex38 questions
7. DM.7Electrode potentials and electrochemical cells24 questions
8. DM.8Practical: measuring the EMF of electrochemical cells and testing electrode potential predictions32 questions

Topic CD: Colour by design

It builds on what you learned at AS in What's in a medicine?, and takes it further.

There are 10 parts: we start with aromatic chemistry, and finish with the practical on test-tube identification of organic functional groups (alkene, halogenoalkane, alcohol, carbonyl, carboxylic acid, phenol).

1. CD.1Aromatic chemistryFree 23 questions
2. CD.2Phenols: acidity, reactions with bromine, bases and acyl chlorides, and the iron(III) chloride testFree 51 questions
3. CD.3Directing effects of substituents in electrophilic substitution of benzene derivatives34 questions
4. CD.4Carbon–carbon bond formation: nitriles, Friedel–Crafts reactions and Grignard reagents20 questions
5. CD.5Diazonium salts and azo dyes: diazotisation and coupling36 questions
6. CD.6Aldehydes and ketones21 questions
7. CD.7The iodoform (triiodomethane) test for CH3CO– and CH3CH(OH)– groups36 questions
8. CD.8Chromatography65 questions
9. CD.9Practical: separating mixtures by thin-layer chromatography and calculating Rf values79 questions
10. CD.10Practical: test-tube identification of organic functional groups (alkene, halogenoalkane, alcohol, carbonyl, carboxylic acid, phenol)58 questions

Topic PS: Practical and maths skills

It builds on what you learned at AS in Development of practical skills in chemistry, and takes it further.

There are 4 parts: we start with maths skills, and finish with planning, analysing and evaluating practical investigations (variables, apparatus, reliability, validity).

1. PS.1Maths skills: logarithms and antilogs, rearranging equations, pH, pKa and Kw calculationsFree 53 questions
2. PS.2Maths skills: graphs, tangents, gradients and intercepts (rate graphs, Arrhenius ln k against 1/T)66 questions
3. PS.3Maths skills: significant figures, units, percentage error and uncertainty in measurements36 questions
4. PS.4Planning, analysing and evaluating practical investigations (variables, apparatus, reliability, validity)34 questions

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