A complete guide to AQA A-Level Chemistry

AQA A-Level Chemistry (specification 7405) is a gateway qualification to medicine, dentistry, veterinary science, pharmacy, chemical engineering, and most natural sciences degrees. It is a linear two-year course, structured around physical, inorganic and organic chemistry, and assessed across three written papers at the end of Year 13.

This guide covers how each paper is structured, what each section of the course covers, how the 12 required practicals appear in the exam, and which revision techniques actually move A-Level chemistry grades.

AQA A-Level Chemistry is a linear qualification: All three papers are sat at the end of Year 13 in the May/June exam series. There is no coursework that contributes to your grade, although the practical endorsement runs alongside the exams.

All three papers are weighted equally and test the same three assessment objectives: Recall, application to unfamiliar contexts, and analysis of practical and quantitative data. Paper 3 includes a multiple choice section and a higher proportion of practical-based questions than Papers 1 and 2.

Each paper mixes short structured questions, longer extended responses, and calculation questions. Paper 3 stands out because of the 30 multiple choice marks at the end, which test breadth across the whole course.

Paper 1 focuses on physical chemistry and inorganic chemistry. The physical chemistry content includes the more quantitative topics (energetics, kinetics, equilibria) and Paper 1 is where students typically face the most calculation-heavy questions.

Atomic structure, amount of substance (the mole, moles in solution, gas laws), bonding, energetics (enthalpy changes, Hess's law, bond enthalpies), kinetics, equilibria, thermodynamics (Gibbs free energy), and rate equations. Equilibrium constants Kp and Kc both appear in Paper 1.

Periodicity, Group 2 (the alkaline earth metals), Group 7 (the halogens), properties of period 3 elements and their oxides, transition metals (including complex ions, ligand substitution, colour, redox chemistry), and reactions of ions in aqueous solution.

Paper 2 covers organic chemistry and the rest of physical chemistry. It is generally regarded as more mechanism-heavy than Paper 1: You need to know reaction conditions, intermediates, and curly arrow mechanisms for every functional group on the spec.

More on energetics and kinetics, plus acids and bases (pH, Ka, buffer calculations), redox and electrochemistry (electrode potentials, electrochemical cells, fuel cells). The acids and bases content overlaps with organic chemistry through carboxylic acid behaviour.

Alkanes, alkenes, halogenoalkanes, alcohols, organic analysis, optical isomerism, aldehydes and ketones, carboxylic acids and derivatives, aromatic chemistry, amines, polymers, amino acids, proteins and DNA, organic synthesis, NMR spectroscopy, and chromatography. You also need to know the test-tube tests for every functional group.

Paper 3 is the synoptic paper. It can draw on any content from across the specification and includes a higher proportion of questions on practical techniques, results, and unfamiliar contexts. The structure is a section of structured questions followed by 30 marks of multiple choice covering breadth across the whole course.

Paper 3 is the paper where students underperform most. The multiple choice section in particular trips people up because each option looks plausible, and the structured questions on practicals reward knowing the apparatus, the safety, and the underlying chemistry to a higher level of detail than Papers 1 and 2.

AQA specifies 12 required practicals across the two-year course. You will not perform them in the exam, but you will be tested on the methods, the variables, the safety considerations, and the underlying chemistry. Around 15% of the marks across all three papers come from practical-related questions.

These are the 12 required practicals you need to know:

Alongside your A-Level grade, you receive a Pass or Fail on the practical endorsement. This is a separate assessment based on your teacher's judgement of your competence in lab work throughout the two-year course, against five Common Practical Assessment Criteria (CPAC). There is no exam.

A pass in the practical endorsement is required for some degree courses, especially medicine, dentistry, veterinary science and chemistry-related sciences. Universities check it when they receive your results. If you fail, your A-Level grade is unaffected, but the endorsement is recorded as Not Classified.

Ofqual requires that at least 20% of the marks in A-Level chemistry test mathematical skills at Level 2 (GCSE higher) or above. Expect lots of moles, ratios, percentage yields, percentage atom economies, equilibrium constants, pH and Ka calculations, rate equation manipulation, Hess cycles, and Gibbs free energy calculations.

The maths itself is rarely difficult: The pressure comes from speed and context. Students who score A* drill calculations until they can carry them out automatically, freeing up working memory to focus on the chemistry. A grade 6 in GCSE maths is the unofficial minimum to keep up, and many top chemistry students also take A-Level maths.

A-Level chemistry is a serious step up from GCSE in both volume of content and the depth of application. Students who get A and A* train themselves to apply chemistry to unfamiliar problems, not just to recall facts.

Mole calculations underpin every paper. If you cannot rearrange n = c × v, n = m / Mr, or pV = nRT under pressure, you will leak marks across the whole A-Level. Practise them daily in the run-up to the exams until they are mechanical.

For every organic mechanism on the spec, learn the conditions, the intermediates, the curly arrows, and the product as one complete picture. Examiners mark every element separately. Flashcards work well: One side has the reactants and conditions, the other has the full mechanism with arrows.

Do not just memorise each method. Learn the variables, the controls, the safety, the sources of error, and the calculations that come with the data. Past paper questions on practicals are some of the most predictable mark-grabbers in the whole course.

Re-reading notes feels productive but barely sticks. Active recall – closing the book and writing what you remember – forces your brain to retrieve information, which is what builds long-term memory. Flashcards or blurting work well for A-Level chemistry because of the high recall load.

Doing a past paper and putting it back on the shelf is wasted work. Mark it honestly, write down every topic where you lost marks, and revise that specific content before doing another paper. The biggest jumps in chemistry scores come from fixing recurring weaknesses, not from doing more papers.