AQA A-Level Chemistry, specification 7405, is assessed through three written papers, each two hours long: Paper 1 and Paper 2 are each worth 105 marks and 35% of the qualification, and Paper 3 is worth 90 marks and the remaining 30%. Paper 1 draws on physical chemistry and the whole of inorganic chemistry, Paper 2 draws on physical chemistry and the whole of organic chemistry, and Paper 3 draws on any part of the specification, including a set of multiple choice questions and a block of synoptic questions that range across the whole course.
Alongside the papers, students complete 12 required practical activities across Year 12 and Year 13, observed by their teacher and reported on the certificate as a separate practical endorsement, distinct from the marks awarded in the written papers. Maths equivalent to Level 2 or above makes up a fifth of the overall assessment, and questions testing practical knowledge make up at least 15%, so preparation needs to combine calculation practice with familiarity around method, apparatus and data handling.
How is AQA A-Level Chemistry assessed?
- Paper 1: 2 hours, 105 marks, 35% of the A-level. Physical chemistry and all of inorganic chemistry, tested through short and long answer questions.
- Paper 2: 2 hours, 105 marks, 35% of the A-level. Physical chemistry and all of organic chemistry, tested through short and long answer questions.
- Paper 3: 2 hours, 90 marks, 30% of the A-level. Any part of the specification and any practical skill, tested through practical technique questions, synoptic questions and multiple choice questions.
What physical chemistry topics are on the specification?
Physical chemistry covers atomic structure, amount of substance, bonding, energetics, kinetics, chemical equilibria, including Le Chatelier's principle and the equilibrium constant Kc, and oxidation, reduction and redox equations in Year 12; Year 13 adds thermodynamics, rate equations, the equilibrium constant Kp, electrode potentials and electrochemical cells, and acids and bases. These Year 13 additions build directly on the Year 12 foundations, so gaps in equilibria or energetics from Year 12 tend to resurface once thermodynamics and Kp are introduced.
- Year 12: atomic structure, amount of substance, bonding, energetics, kinetics, chemical equilibria (Le Chatelier's principle and Kc), oxidation, reduction and redox equations.
- Year 13 only: thermodynamics, rate equations, the equilibrium constant Kp, electrode potentials and electrochemical cells, acids and bases.
What inorganic chemistry topics are on the specification?
Inorganic chemistry covers periodicity, Group 2 and Group 7 in Year 12; Year 13 adds the properties of Period 3 elements and their oxides, transition metals and the reactions of ions in aqueous solution. It carries fewer Year 13-only additions than physical or organic chemistry, which makes it a manageable branch to consolidate early in Year 13 before attention shifts to the larger organic and physical topics.
- Year 12: periodicity, Group 2, Group 7.
- Year 13 only: properties of Period 3 elements and their oxides, transition metals, reactions of ions in aqueous solution.
What organic chemistry topics are on the specification?
Organic chemistry begins with an introduction to the subject, alkanes, halogenoalkanes, alkenes, alcohols and organic analysis in Year 12, then extends substantially in Year 13 to optical isomerism, aldehydes and ketones, carboxylic acids and their derivatives, aromatic chemistry, amines, polymers, amino acids, proteins and DNA, organic synthesis, NMR spectroscopy and chromatography. It carries the largest number of Year 13-only topics of the three branches, so organic chemistry tends to need the most sustained revision time across Year 13, particularly where synthesis questions require linking several reaction types across topics.
- Year 12: introduction to organic chemistry, alkanes, halogenoalkanes, alkenes, alcohols, organic analysis.
- Year 13 only: optical isomerism, aldehydes and ketones, carboxylic acids and derivatives, aromatic chemistry, amines, polymers, amino acids, proteins and DNA, organic synthesis, NMR spectroscopy, chromatography.
What does Paper 3 cover?
Paper 3 carries 90 marks split between three question types: 40 marks on practical techniques and data analysis, 20 marks of questions that test understanding synoptically across the whole specification, and 30 marks of multiple choice questions. It can draw on any topic from physical, inorganic or organic chemistry and any practical skill covered across the two years, so revision for it works best once the other two papers' content has already been consolidated. Because the synoptic and multiple choice sections range freely across the specification, practice for Paper 3 benefits from mixed-topic question sets instead of the single-topic practice that suits earlier revision.
What are the required practical activities and the practical endorsement?
AQA specifies 12 required practical activities that students carry out across Year 12 and Year 13, and reports a practical endorsement on the certificate separately from the A-level grade. The endorsement is assessed by teachers through direct observation, judged against the Common Practical Assessment Criteria, and students who meet the standard across all five criteria receive a Pass, which appears on the certificate as a separate result and does not contribute marks to the overall grade.
- Following written procedures.
- Applying investigative approaches with instruments and equipment.
- Safe use of equipment and materials.
- Making and recording observations.
- Researching and reporting.
How much of the mark scheme covers maths and practical skills?
Twenty per cent of the overall assessment tests mathematical skills equivalent to Level 2 or above, spread across all three papers instead of collected into a standalone maths paper. At least 15% of the assessment tests knowledge, skills and understanding built through practical work, examined through written questions on method, data handling and evaluation, separate from the 12 required practicals that sit outside the paper marks in the endorsement. Together these shares mean a meaningful portion of every paper's marks depend on calculation and practical reasoning, not recall of content alone.
How should a student prepare for the exam across Year 12 and Year 13?
Year 12 preparation works best broken down by specification point: after each topic in physical, inorganic or organic chemistry, a student should attempt AQA's past paper questions on that topic alone, then mark the answers against the published mark scheme to see exactly which marking points were missed. Building a bank of topic-level practice this way makes the move to full papers in Year 13 more manageable, since Paper 3's synoptic and multiple choice questions expect the content from all three branches to be held in mind at once.
In Year 13, practice should shift towards timed, complete papers sat under exam conditions, working through Paper 1, Paper 2 and Paper 3 in full so timing and question order become familiar alongside the content. AQA publishes examiner reports alongside each set of past papers and mark schemes, describing the errors and misconceptions markers see most often on a given paper; reading the report for a paper straight after marking it against the mark scheme turns each attempt into a specific list of things to fix, beyond a single mark out of 105 or 90.
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Frequently asked questions
- Does the practical endorsement affect a student's A-level chemistry grade?
- No marks from the practical endorsement feed into the overall A-level grade. It is reported as a separate Pass on the certificate, based on a teacher's direct observation of a student's work across the 12 required practicals. The written papers still test practical knowledge, since at least 15% of the marks across Paper 1, Paper 2 and Paper 3 examine understanding of method, data and evaluation drawn from practical work.
- How many hours of exams does the chemistry A-level involve?
- The qualification is assessed through three papers, each two hours long, giving six hours of written exams in total. Paper 1 and Paper 2 are each worth 105 marks, and Paper 3 is worth 90 marks, for 300 marks overall. The grade comes from these three papers; the practical endorsement is reported separately.
- Is there a separate maths paper in A-level chemistry?
- Maths worth a fifth of the overall assessment, equivalent to Level 2 or above, is embedded as calculation and data questions inside Paper 1, Paper 2 and Paper 3. Students meet this maths throughout ordinary revision of physical, inorganic and organic chemistry, without a separate maths paper or section to prepare for on its own.
- What's the difference between an AQA mark scheme and an examiner report?
- A mark scheme sets out exactly how marks are awarded for each question, including the specific points and acceptable answers a marker looks for, and AQA publishes one alongside every past paper. An examiner report, published for the same paper, explains how candidates actually performed and describes the errors seen most often. Using the mark scheme to self-mark first, then the report to understand recurring mistakes, sharpens exam technique.
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