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Edexcel A-Level Chemistry (9CH0): complete guide to the topics and the exams

A complete guide to Pearson Edexcel A-Level Chemistry (specification 9CH0). Covers all 19 topics from atomic structure to NMR and chromatography, how the three written papers are structured and marked, the 16 core practicals, the maths demand, and how to study each topic for top grades.

Browse guides →Syllabus dot points (21)

Edexcel A-Level Chemistry (specification 9CH0) is a two-year linear course assessed by three written papers at the end of Year 13. There is no coursework grade; practical work is reported separately as the Science Practical Endorsement. This page is the index: below is a map of the 19 topics, the exam structure, and how to study each one.

The 19 Edexcel Chemistry topics

The specification is organised into 19 numbered topics, taught across two years. The earlier topics form the first-year (AS) content; the later topics are second-year A-level content. We group them into four study blocks.

Structure, bonding and introductory organic (Topics 1-6)
Atomic structure and the periodic table, bonding and structure, redox I, inorganic chemistry and the periodic table (Group 2 and Group 7), formulae, equations and amounts of substance (the moles toolkit), and the introductory organic chemistry of alkanes and alkenes.
Energetics, equilibria and organic I (Topics 7-11)
Energetics I (enthalpy, calorimetry, Hess's law and bond enthalpies), intermolecular forces, kinetics I (collision theory and the Maxwell-Boltzmann distribution), equilibrium I (Le Chatelier and Kc), and organic chemistry II (alcohols, haloalkanes and an introduction to spectroscopy).
Physical and inorganic II (Topics 12-17)
Thermodynamics (Born-Haber cycles, entropy and Gibbs free energy), redox II (electrode potentials and cells), transition metals, kinetics II (rate equations), equilibrium II (Kc and Kp calculations), and acid-base equilibria.
Organic II and analysis (Topics 18-19)
Organic chemistry III (aromatics, carbonyls and acids), organic nitrogen and polymers, organic synthesis and chirality, and modern analytical techniques (NMR and chromatography).

Exam structure

Edexcel A-Level Chemistry is assessed by three written papers, all sat at the end of the course. A calculator is allowed in every paper, and all three papers can draw on any topic.

  • Paper 1 - Advanced Inorganic and Physical Chemistry. 1 hour 45 minutes, 90 marks, 30 per cent. Focuses on the physical and inorganic topics.
  • Paper 2 - Advanced Organic and Physical Chemistry. 1 hour 45 minutes, 90 marks, 30 per cent. Focuses on the organic topics, modern analysis and relevant physical chemistry.
  • Paper 3 - General and Practical Principles in Chemistry. 2 hours 30 minutes, 120 marks, 40 per cent. The synoptic paper, heavily focused on practical techniques and data analysis across the whole specification.

At least 20 per cent of marks assess maths skills, and practical skills from the 16 core practicals are tested across all three papers.

How to study Edexcel Chemistry

Chemistry rewards quantitative fluency, precise recall of reactions and trends, and confident mechanism drawing.

  1. Work from the specification topics. Each of the 19 numbered topics is a checklist; questions are written from them. Turn each statement into a flashcard.
  2. Drill the maths. With 20 per cent of marks mathematical, moles, titrations, equilibria, rates, pH and thermodynamics calculations must be automatic.
  3. Master mechanisms and pathways. Organic marks reward correct curly arrows, conditions and reagents; build a reaction map linking functional groups.
  4. Learn the core practicals. The 16 core practicals and their techniques recur across all three papers, especially the synoptic Paper 3.
  5. Practise application and synoptic questions. Paper 3 connects topics and favours unfamiliar contexts and data, so drill past papers from the start of Year 13.

Work through the topics

Each study block has an overview guide and a set of dot-point answer pages with worked exam questions and cross-links: structure, bonding and introductory organic; energetics, equilibria and organic I; physical and inorganic II; and organic II and analysis.

For the official specification

Pearson publishes the full specification (9CH0), past papers and mark schemes at qualifications.pearson.com. Always revise from the current specification and Edexcel's own past papers, because question style and the Paper 3 format are board-specific.

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Common questions about Chemistry

How is Edexcel A-Level Chemistry (9CH0) structured?
Edexcel A-Level Chemistry is a two-year linear course assessed entirely by three written exams at the end of Year 13. The content is organised into 19 numbered topics, from atomic structure and bonding through energetics, kinetics, equilibria and redox, to the full organic course and modern analytical techniques. The earlier topics form the AS content; the later topics are second-year A-level. There is no coursework grade, but practical competence is reported separately as the Science Practical Endorsement.
What are the three Edexcel A-Level Chemistry exam papers?
Paper 1 (Advanced Inorganic and Physical Chemistry) is 1 hour 45 minutes, 90 marks and worth 30 per cent, covering Topics 1 to 5, 8 to 10 and 11 to 15 plus the inorganic topics. Paper 2 (Advanced Organic and Physical Chemistry) is also 1 hour 45 minutes, 90 marks and 30 per cent, covering the organic topics plus modern analytical techniques and relevant physical chemistry. Paper 3 (General and Practical Principles in Chemistry) is 2 hours 30 minutes, 120 marks and worth 40 per cent, and is synoptic, testing practical skills and data analysis across the whole specification.
What maths skills does Edexcel A-Level Chemistry require?
At least 20 per cent of the marks across the papers assess Level 2 (GCSE higher tier and above) mathematical skills. Expect moles and titration calculations, the ideal gas equation, percentage yield and atom economy, rate equations and orders, the equilibrium constants Kc and Kp, pH and acid-base calculations, Gibbs free energy and entropy, and reading and plotting graphs. A calculator is allowed in every paper.
What are the core practicals and the Science Practical Endorsement?
There are 16 core practicals, for example making a standard solution and titration, measuring an enthalpy change, investigating reaction rates, electrochemical cells, tests for organic functional groups, and preparing an organic solid by recrystallisation. They are not assessed in a lab exam, but practical skills are tested across the written papers, especially the synoptic Paper 3. Separately, your teacher assesses hands-on competence; passing earns the Science Practical Endorsement reported alongside your grade.
How should I structure my Edexcel A-Level Chemistry revision?
Work topic by topic against the 19 numbered specification topics, because questions are written directly from them. Master the moles toolkit (Topic 5) first because it underpins almost every calculation, then build atomic structure, bonding and energetics, then the physical-chemistry calculations, and weave the organic reaction map and mechanisms throughout. Drill the maths until it is automatic and practise the synoptic, practical-focused Paper 3 from the start of Year 13.
How does Edexcel A-Level Chemistry compare to other exam boards?
All A-Level Chemistry specifications (Edexcel, AQA, OCR, Eduqas) cover the same core regulated content, so topics such as bonding, equilibria and organic mechanisms are broadly the same everywhere. Edexcel's distinctive features are the 19-topic numbering, the paper split into Advanced Inorganic and Physical (Paper 1), Advanced Organic and Physical (Paper 2) and the synoptic, practical-focused General and Practical Principles (Paper 3), and its specific list of 16 core practicals. Always revise from the current Edexcel specification and Edexcel past papers, because question style is board-specific.
What's the difference between ionic and covalent bonding?
Ionic: electrons are transferred between atoms (typically metal + non-metal); forms a lattice. Covalent: electrons are shared (non-metal + non-metal); forms discrete molecules or networks.
How do I calculate pH?
pH = -log₁₀[H⁺]. For strong acids/bases, [H⁺] equals the concentration. For weak acids, use Ka. For buffers, use Henderson-Hasselbalch.
What's Le Chatelier's principle?
When a system at equilibrium is disturbed (concentration, temperature, pressure change), the equilibrium shifts to partially counteract the disturbance.
How do I balance a redox equation?
Identify the half-reactions (oxidation and reduction), balance atoms (excluding O and H), balance O with H₂O and H with H⁺, balance charge with electrons, then combine so electrons cancel.
What's the difference between enthalpy and entropy?
Enthalpy (ΔH) is the heat change of a reaction. Entropy (ΔS) is the change in disorder. Gibbs free energy (ΔG = ΔH - TΔS) tells you if the reaction is spontaneous.