About the exam
A-level Chemistry Exam structure
An independent A-level Chemistry study guide built from the DfE common content and scientific-skills requirements, cross-checked against current AQA, Pearson Edexcel and OCR Chemistry A and B specifications.
Issuer and path
A-level Chemistry Study Guide is administered through England A-level awarding bodies. Check official resources before booking, retesting, or relying on a stale requirement.
England A-level Chemistry Common Core
0 scored + 0 pretest
The DfE knowledge, practical and mathematical requirements common to regulated AS and A-level Chemistry specifications in England, organised for study rather than as one board's paper split.
Use your own board's current specification
Check the exact entry code, data or formula booklet, paper content, required practical activities and any safety or content updates for your cohort. Do not substitute an International A Level or another Chemistry route.
Official Outline Coverage Map
Coverage is mapped to official outline item counts so content depth can be checked without hard-coding a single exam.
| Topic | Official outline items | Your questions | Your flashcards | Confidence |
|---|---|---|---|---|
| Experimental Design, Variables and Risk | 0 | 24 | 5 | Strong |
| Measurement, Data and Uncertainty | 0 | 24 | 5 | Priority |
| Core Practical Techniques | 0 | 24 | 5 | Priority |
| Atomic Structure, Isotopes and Mass Spectrometry | 0 | 26 | 5 | Strong |
| Moles, Formulae and Stoichiometry | 0 | 26 | 5 | Priority |
| Bonding, Shape and Polarity | 0 | 26 | 5 | Strong |
| Structure, Intermolecular Forces and Properties | 0 | 26 | 5 | Strong |
| Energetics and Thermodynamics | 0 | 30 | 5 | Priority |
| Kinetics and Rate Equations | 0 | 30 | 5 | Priority |
| Equilibria, Acids, Bases and Buffers | 0 | 30 | 5 | Priority |
| Redox and Electrochemistry | 0 | 30 | 5 | Priority |
| Periodicity and Periodic Trends | 0 | 22 | 5 | Strong |
| Group Chemistry and Qualitative Ions | 0 | 24 | 5 | Priority |
| Transition Metals, Complexes and Catalysis | 0 | 24 | 5 | Priority |
| Organic Formulae, Nomenclature and Isomerism | 0 | 21 | 5 | Strong |
| Alkanes, Alkenes and Hydrocarbons | 0 | 22 | 5 | Priority |
| Halogenoalkanes and Alcohols | 0 | 22 | 5 | Priority |
| Reaction Mechanism Principles | 0 | 20 | 5 | Priority |
| Carbonyls, Carboxylic Acids and Derivatives | 0 | 24 | 5 | Priority |
| Aromatic Chemistry and Amines | 0 | 22 | 5 | Priority |
| Polymers, Amino Acids and Proteins | 0 | 20 | 5 | Good |
| Organic Synthesis and Route Planning | 0 | 24 | 5 | Priority |
| Spectroscopic Structure Analysis | 0 | 30 | 5 | Priority |
| Chromatography, Identification and Sustainable Chemistry | 0 | 30 | 5 | Priority |
How to use this guide
How to study A-level Chemistry
Represent the species and process correctly, conserve atoms, charge and energy, calculate with units, then test the result against observations and chemical evidence.
1. Represent the chemical system
Write the species, formulae, states, charges, structure or electron movement needed for the task.
2. Apply conservation and principle
Conserve atoms, charge, electrons and energy while selecting the governing stoichiometric, energetic, kinetic or equilibrium relationship.
3. Calculate or trace the mechanism
Show substitutions, units, significant figures or every bond-making and bond-breaking step explicitly.
4. Test against evidence
Check magnitude, sign, observation, spectrum, conditions, uncertainty and alternative explanations before concluding.
Experimental Design, Variables and Risk
Planning valid chemical investigations with a testable hypothesis, controlled variables, appropriate controls and repeats, ethical practice and proportionate risk management.
Key rules
Rule 1
A valid design changes or compares the independent variable, measures the dependent variable and controls relevant confounding variables.
Exam cue: State how and why each controlled variable could affect the result.
Rule 2
Accuracy, precision, repeatability, reproducibility and validity describe different qualities of experimental evidence.
Exam cue: Link every method improvement to a specific source of uncertainty, bias or risk.
Rule 3
Risk assessment identifies hazards, exposure routes, likelihood and severity before selecting control measures and disposal methods.
Exam cue: Choose apparatus from the required range, precision, chemical compatibility and safety constraints.
Common traps
Calling a measurement accurate because repeated values are close together.
Prevention: Do not substitute a memorised equation, mechanism or trend until you have identified the species, conditions and chemical model required.
Assuming extra repeats remove systematic error.
Prevention: Do not substitute a memorised equation, mechanism or trend until you have identified the species, conditions and chemical model required.
Naming a hazard without assessing the risk under the actual conditions.
Prevention: Do not substitute a memorised equation, mechanism or trend until you have identified the species, conditions and chemical model required.
Memory anchors
Independent Variable
The independent variable is deliberately changed or used to define comparison groups.
Dependent Variable
The dependent variable is the measured response.
Precision
Precision describes how closely repeated measurements agree.
Accuracy
Accuracy describes closeness to the accepted or true value.
Risk Assessment
Identify hazards, assess likelihood and severity, then apply proportionate controls.
Next best moves
Quick check-up
Use a short quiz to confirm the rule pattern is actually sticking.
Check-up Questions
A student compares how chloride and iodide ions affect the rate of persulfate decomposition. Which variable should be deliberately changed?
Two groups obtain closely clustered titres, but both use a pipette that delivers 24.70 cm³ instead of 25.00 cm³. How should their data be described?
Answer all questions to submit.
Next step personalized recommendations
Open another topic next
Official resources
Verify the details with the official sources
Use these links for eligibility, scheduling, handbook rules, and issuer updates. Our guide helps you study; official sources tell you what the testing partner currently requires.
DfE GCE AS and A-level science subject content
The common Chemistry knowledge, scientific practice, apparatus and mathematical requirements for England.
Ofqual GCE science conditions and requirements
The regulated assessment objectives and practical-science requirements.
AQA A-level Chemistry 7405
Current AQA content, assessment, mathematical and practical requirements.
Pearson Edexcel A-level Chemistry 9CH0
Current Pearson qualification page, Issue 3 specification and assessment resources.
OCR Chemistry A H432
Current content-led OCR A-level route and practical materials.
OCR Chemistry B (Salters) H433
Current context-led OCR A-level route; the published AS H033 withdrawal does not withdraw H433.
FAQ
Common A-level Chemistry questions
Is this an official exam-board study guide?
No. It is an independent resource based on the DfE subject content and scientific-skills requirements common to regulated England specifications, then checked against current AQA, Pearson Edexcel and OCR materials.
Why does the guide not follow physical, inorganic and organic paper splits exactly?
Boards group and assess content differently, and practical or physical chemistry may appear across papers. This guide organises the shared concepts for learning; use your board's specification for exact paper coverage and rubric.
Do all boards use the same required practicals?
No. The common rules require at least 12 practical activities covering prescribed skills and apparatus, but each awarding organisation defines its own activities. Use the current practical handbook and records for your entry.
What is the difference between OCR Chemistry A and Chemistry B?
OCR H432 is content-led, while Chemistry B (Salters) H433 develops chemistry through contexts and applications. Both are regulated A-level routes sharing the DfE core. OCR's announced withdrawal concerns AS Chemistry B H033, not A-level H433.
Are the topic allocations official weights?
No. DfE specifies common content and Ofqual sets assessment objectives, but there is no shared official percentage for these 24 study topics. The allocations balance this independent 601-question practice bank.
What should I learn first?
Begin with measurement, moles, equations, atomic structure, bonding and intermolecular forces. Physical, inorganic and organic problems all depend on these foundations.