Grade A* · A-Level · A-Level Chemistry
How to get an A* in A-Level Chemistry
What does getting a A* in A-Level Chemistry take?
An A* in A-Level Chemistry rewards three abilities: drawing accurate organic mechanisms with correct curly arrows, executing multi-step calculations (mole/concentration/percentage yield chains) under time pressure, and writing synoptic answers that combine physical, inorganic and organic topics. Required-practical questions remain decisive at the boundary.
What grade-A* students do differently
- 1
Master organic mechanisms with curly arrows
AQA 7405, Edexcel 9CH0 and OCR H432 all reward correctly-drawn mechanisms. Each curly arrow has a start and an end; markers reject arrows that originate from the wrong electron source.
- 2
Drill multi-step calculation chains
Titration → moles → concentration → percentage yield. Each step compounds errors. Practise reaching the final answer with 100% accuracy on a single calculation chain.
- 3
Memorise inorganic test results
Group 2, Group 7, transition metals: colour changes, flame tests, precipitate identification. These are recall-heavy and reliably examined.
- 4
Practise synoptic 'explain why' questions
Linking enthalpy changes to entropy + Gibbs free energy. Linking ionic radius to lattice energy and solubility. Linking electron configuration to atomic radius trends. The A* paper rewards depth across these connections.
- 5
Master required-practical detail
12 required practicals at A-Level. Apparatus, observation, expected result and sources of error are all examinable.
Where the marks are lost
Examiner reports flag:
- Organic mechanisms — incorrect curly-arrow direction (always: arrow from electron pair to where it ends up).
- Calculation chains — premature rounding, wrong units, dropped factors.
- Inorganic identification — confusing copper(II) sulfate with iron(II) sulfate test results.
- Equilibrium questions — forgetting to consider how Kc/Kp respond to temperature changes.
Required practical depth
Practicals like 'preparation of an organic solid' or 'determination of enthalpy change' are examined every year with variations on apparatus or scale. Master the technique, not just the procedure.
Frequently asked
- What percentage is an A* in A-Level Chemistry?
- Typically 80–85% across all three papers in recent years. Each board (AQA, Edexcel, OCR) sets the boundary after marking.
- How heavy is the maths in A-Level Chemistry?
- Around 20% of marks involve quantitative work — much of it overlapping with the Higher GCSE Maths skill set (rearranging equations, manipulating logs, unit conversion). A-Level Maths is helpful but not required.
- Are the required practicals examined directly?
- Yes — questions about practical method, apparatus, errors and improvements appear on the written papers, not just in the practical endorsement. Around 15% of total marks.
Go deeper on the topics that matter
Topic-by-topic guides aligned to the exam-board specifications.
A-Level Chemistry glossary terms
- TitrationTitration is a quantitative analysis technique that determines the concentration of an unknown solution by reacting it with a standard solution of known concentration until a clear end point. For acid–base titrations, an indicator (phenolphthalein, methyl orange) changes colour at the end point; for redox titrations, a self-indicating species like potassium manganate(VII) does the job. Required practical on every UK board.
- Mole calculationsMole calculations convert between mass, moles and particles in chemistry. Core equations: n = m / Mr (moles from mass + relative formula mass), n = C × V (for solutions, with C in mol/dm³ and V in dm³), n = V / 24 (for gases at room temperature and pressure). Higher-tier GCSE Chemistry asks for mole ratios from balanced equations — read the equation as 'per mole of A, you need x moles of B'.
- Ionic bondingIonic bonding is the electrostatic attraction between oppositely-charged ions, formed when atoms transfer electrons to achieve full outer shells. A metal donates electron(s) to become a positive cation; a non-metal accepts to become a negative anion. The resulting compound has high melting/boiling points, conducts electricity when molten or dissolved (free ions to carry charge), and is typically brittle. Examples: NaCl, MgO, CaCl₂.
- Le Chatelier's principleLe Chatelier's principle states that when a dynamic equilibrium is disturbed, the system shifts to partially counteract the change. Increase the concentration of a reactant → equilibrium shifts toward products. Increase temperature → equilibrium shifts in the endothermic direction. Increase pressure → equilibrium shifts toward the side with fewer gas molecules. A-Level Chemistry uses it to predict yield changes in industrial processes (Haber, Contact).
- Required practicalsRequired practicals are specified science experiments that students must carry out to pass the practical-skills component of GCSE and A-Level Sciences. Exam boards (AQA, Edexcel, OCR) publish a list of around 8 GCSE and 12 A-Level required practicals per science. They are not directly marked, but written exams ask questions about apparatus, technique, hazards and analysis using the required practicals as context.
Related on StudyVector
Last updated: . StudyVector is independent and is not affiliated with AQA, Edexcel, OCR or JCQ. Grade boundaries are set by the awarding body each year and are subject to change.