OCR A A-level Chemistry Year 13 revision

Topic 5.1.1: How fast?

It builds on what you learned at AS in Reaction rates, and takes it further.

There are 3 parts: we start with rate equations, and finish with the practical on measuring reaction rates by initial-rate and continuous-monitoring methods (including iodine–propanone and clock reactions).

1. 5.1.1.1Rate equations63 questions
2. 5.1.1.2Half-life of first-order reactions and concentration–time graphs73 questions
3. 5.1.1.3Practical: measuring reaction rates by initial-rate and continuous-monitoring methods (including iodine–propanone and clock reactions)Free 78 questions

Topic 5.1.2: How far?

It builds on what you learned at AS in Chemical equilibrium, and takes it further.

There are 2 parts: we start with equilibrium constant Kc, and finish with equilibrium constant Kp.

1. 5.1.2.1Equilibrium constant Kc: expressions, units, calculations and the effect of temperature64 questions
2. 5.1.2.2Equilibrium constant Kp15 questions

Topic 5.1.3: Acids, bases and buffers

It builds on what you learned at AS in Acids, and takes it further.

There are 2 parts: we start with acids, bases and buffers, and finish with the practical on pH curves, determining Ka of a weak acid and making and testing buffers.

1. 5.1.3.1Acids, bases and buffers38 questions
2. 5.1.3.2Practical: pH curves, determining Ka of a weak acid and making and testing buffers46 questions

Topic 5.2: Energy: lattice enthalpy, enthalpy and entropy

It builds on what you learned at AS in Enthalpy changes, and takes it further.

We will go through it step by step.

1. 5.2.1ThermodynamicsFree 28 questions

Topic 5.2.3: Redox and electrode potentials

It builds on what you learned at AS in Redox, and takes it further.

There are 3 parts: we start with redox titrations, and finish with the practical on measuring the EMF of electrochemical cells and testing electrode potential predictions.

1. 5.2.3.1Redox titrations: manganate(VII), dichromate(VI) and iodine–thiosulfate calculations76 questions
2. 5.2.3.2Electrode potentials and electrochemical cells24 questions
3. 5.2.3.3Practical: measuring the EMF of electrochemical cells and testing electrode potential predictions32 questions

Topic 5.3.1: Transition elements

It builds on what you learned at AS in Electrons, bonding and structure, and takes it further.

There are 4 parts: we start with transition metals, and finish with colorimetry and visible spectroscopy.

1. 5.3.1.1Transition metals23 questions
2. 5.3.1.2Practical: test-tube reactions of transition metal ions (precipitation, ligand exchange, redox)30 questions
3. 5.3.1.3Practical: preparation of a transition metal complex38 questions
4. 5.3.1.4Colorimetry and visible spectroscopy: determining the concentration and formula of complex ions68 questions

Topic 5.3.2: Qualitative analysis

It builds on what you learned at AS in Qualitative analysis, and takes it further.

We will go through it step by step.

1. 5.3.2.1Reactions of ions in aqueous solution58 questions

Topic 6.1.1: Aromatic compounds

It builds on what you learned at AS in Alkenes, and takes it further.

There are 3 parts: we start with aromatic chemistry, and finish with directing effects of substituents in electrophilic substitution of benzene derivatives.

1. 6.1.1.1Aromatic chemistryFree 23 questions
2. 6.1.1.2Phenols: acidity, reactions with bromine, bases and acyl chlorides, and the iron(III) chloride testFree 51 questions
3. 6.1.1.3Directing effects of substituents in electrophilic substitution of benzene derivatives34 questions

Topic 6.1.2: Carbonyl compounds

It builds on what you learned at AS in Alcohols, and takes it further.

There are 2 parts: we start with aldehydes and ketones, and finish with the iodoform (triiodomethane) test for CH3CO– and CH3CH(OH)– groups.

1. 6.1.2.1Aldehydes and ketones21 questions
2. 6.1.2.2The iodoform (triiodomethane) test for CH3CO– and CH3CH(OH)– groups36 questions

Topic 6.1.3: Carboxylic acids and esters

It builds on what you learned at AS in Alcohols, and takes it further.

We will go through it step by step.

1. 6.1.3.1Carboxylic acids and derivatives41 questions

Topic 6.2.1: Amines

It builds on what you learned at AS in Haloalkanes, and takes it further.

There are 2 parts: we start with amines, and finish with diazonium salts and azo dyes.

1. 6.2.1.1Amines16 questions
2. 6.2.1.2Diazonium salts and azo dyes: diazotisation and coupling36 questions

Topic 6.2.2: Amino acids, amides and chirality

It builds on what you learned at AS in Basic concepts of organic chemistry, and takes it further.

There are 2 parts: we start with amino acids, proteins and DNA, and finish with optical isomerism.

1. 6.2.2.1Amino acids, proteins and DNA41 questions
2. 6.2.2.2Optical isomerismFree 23 questions

Topic 6.2.3: Polyesters and polyamides

It builds on what you learned at AS in Alkenes, and takes it further.

We will go through it step by step.

1. 6.2.3.1Polymers28 questions

Topic 6.2.4: Carbon–carbon bond formation

It builds on what you learned at AS in Haloalkanes, and takes it further.

We will go through it step by step.

1. 6.2.4.1Carbon–carbon bond formation: nitriles, Friedel–Crafts reactions and Grignard reagents20 questions

Topic 6.2.5: Organic synthesis

It builds on what you learned at AS in Organic synthesis, and takes it further.

There are 3 parts: we start with organic synthesis, and finish with the practical on test-tube identification of organic functional groups (alkene, halogenoalkane, alcohol, carbonyl, carboxylic acid, phenol).

1. 6.2.5.1Organic synthesisFree 23 questions
2. 6.2.5.2Practical: preparing a pure organic solid (e.g. aspirin), recrystallisation and melting-point purity test82 questions
3. 6.2.5.3Practical: test-tube identification of organic functional groups (alkene, halogenoalkane, alcohol, carbonyl, carboxylic acid, phenol)58 questions

Topic 6.3.1: Chromatography and qualitative analysis

It builds on what you learned at AS in Analytical techniques, and takes it further.

There are 2 parts: we start with chromatography, and finish with the practical on separating mixtures by thin-layer chromatography and calculating Rf values.

1. 6.3.1.1Chromatography65 questions
2. 6.3.1.2Practical: separating mixtures by thin-layer chromatography and calculating Rf values79 questions

Topic 6.3.2: Spectroscopy

It builds on what you learned at AS in Analytical techniques, and takes it further.

There are 2 parts: we start with nuclear magnetic resonance spectroscopy, and finish with combined structure determination using mass spectrometry, IR, 13C and 1H NMR data.

1. 6.3.2.1Nuclear magnetic resonance spectroscopy64 questions
2. 6.3.2.2Combined structure determination using mass spectrometry, IR, 13C and 1H NMR data39 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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