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Edexcel GCSE Chemistry (1CH0): complete guide to the nine topics, the two papers and the core practicals

A complete guide to Pearson Edexcel GCSE Chemistry (specification 1CH0). Covers the nine content topics, how the two written papers are structured and marked, the Foundation and Higher tiers, the eight core practicals, the maths and equation demand, the separate chemistry content, and how to study each topic for grades 8 and 9.

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Pearson Edexcel GCSE Chemistry (specification 1CH0) is a linear course assessed by two written papers sat at the end of the course. There is no coursework, but practical skills are assessed within the written papers. This page is the index: below is a map of the nine topics, the tier structure, the exam papers, the core practicals, and how to study each topic.

The nine Edexcel Chemistry topics

The specification has nine numbered topics. Paper 1 examines topics 1 to 5 and Paper 2 examines topic 1 again plus topics 6 to 9.

Topic 1 Key concepts in chemistry
Atomic structure, isotopes and the development of the model of the atom, the periodic table and electronic configurations, ionic, covalent and metallic bonding, the structures and properties of substances, and the core calculations (relative formula mass, percentage by mass, empirical formulae, reacting masses, concentration and the mole).
Topic 2 States of matter and mixtures
The particle model and changes of state, pure substances and mixtures, and the separation techniques including filtration, crystallisation, distillation and chromatography.
Topic 3 Chemical changes
Acids, bases and the pH scale, strong and weak acids, the reactions of acids, preparing soluble and insoluble salts, titration, and electrolysis of molten compounds and aqueous solutions.
Topic 4 Extracting metals and equilibria
The reactivity series, oxidation and reduction, extracting metals by reduction with carbon and by electrolysis, alternative biological methods, and reversible reactions and dynamic equilibrium.
Topic 5 Separate chemistry 1
Transition metals, alloys and corrosion, and extended quantitative analysis including titration calculations, concentration in mol/dm3, gas volumes, percentage yield and atom economy. Separate science only.
Topic 6 Groups in the periodic table
The properties and trends of Group 1 (the alkali metals), Group 7 (the halogens) including displacement reactions, and Group 0 (the noble gases).
Topic 7 Rates of reaction and energy changes
Collision theory and the factors affecting rate, measuring rates and the effect of catalysts, exothermic and endothermic reactions and reaction profiles, and bond-energy calculations.
Topic 8 Fuels and Earth science
Crude oil, hydrocarbons, fractional distillation, combustion and cracking, the pollutants from burning fuels, and the evolution of the atmosphere and the greenhouse effect.
Topic 9 Separate chemistry 2
Qualitative analysis (flame tests and tests for cations and anions), alcohols and carboxylic acids, and polymers, materials and life cycle assessment. Separate science only.

Foundation and Higher tiers

The qualification is tiered. You sit both papers at one tier.

  • Foundation tier targets grades 1 to 5 and covers the core content of all nine topics.
  • Higher tier targets grades 4 to 9 and adds harder material such as the mole-based calculations, titration and gas-volume work, half-equations, and some extended explanations.

Exam structure

Edexcel GCSE Chemistry is assessed by two written papers, both sat at the end of the course. A calculator is allowed in both.

  • Paper 1 (codes 1CH0/1F and 1CH0/1H), topics 1 to 5. 1 hour 45 minutes, 100 marks, 50%.
  • Paper 2 (codes 1CH0/2F and 1CH0/2H), topic 1 plus topics 6 to 9. 1 hour 45 minutes, 100 marks, 50%.

Each paper has multiple choice, short answer, calculation and extended open-response questions. Around 20% of marks assess maths skills, the most of the three sciences.

The core practicals

There are eight core practicals, including investigating inks by simple distillation and chromatography, preparing pure dry hydrated copper sulfate crystals, an acid-alkali titration, electrolysis of copper sulfate solution, investigating the rate of reaction by a colour change and by the volume of gas produced, and investigating temperature changes in reacting solutions. They are tested in the written papers, so learn the apparatus, variables, method, results and safety for each.

How to study Edexcel Chemistry

Chemistry rewards precise recall, confident calculation and clear extended answers.

  1. Work from the specification statements. Each numbered point (for example 1.50, the mole) is a checklist; questions are written from them.
  2. Master the topic 1 calculations early. Relative formula mass, empirical formulae, reacting masses, concentration and the mole reappear across topics and carry many marks.
  3. Drill balancing and equations. Practise symbol, ionic and half-equations until they are automatic.
  4. Learn the core practicals. The eight methods and their apparatus recur in both papers.
  5. Practise six-mark answers and timed papers. Extended responses and full past papers build the technique examiners reward, and you should revise the Paper 1 and Paper 2 content separately.

The nine topics, dot point by dot point

Each topic has specification-statement-level answer pages with worked exam questions and cross-links. Start with the topic overviews: the Key concepts overview, the States of matter and mixtures overview, the Chemical changes overview, the Extracting metals and equilibria overview, the Separate chemistry 1 overview, the Groups in the periodic table overview, the Rates and energy changes overview, the Fuels and Earth science overview and the Separate chemistry 2 overview.

For the official specification

Pearson publishes the full specification (1CH0), past papers and mark schemes at qualifications.pearson.com. Always revise from the current specification and Edexcel's own past papers, because question style is board-specific.

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Common questions about Chemistry

How is Edexcel GCSE Chemistry (1CH0) structured?
Edexcel GCSE Chemistry is a single linear course assessed by two written papers sat at the end of the course. The content is organised into nine topics: key concepts in chemistry, states of matter and mixtures, chemical changes, extracting metals and equilibria, separate chemistry 1, groups in the periodic table, rates of reaction and energy changes, fuels and Earth science, and separate chemistry 2. It is tiered into Foundation (grades 1 to 5) and Higher (grades 4 to 9), and there is no coursework, though practical skills are assessed in the written papers.
What are the two Edexcel GCSE Chemistry exam papers?
There are two papers, each worth 100 marks, lasting 1 hour 45 minutes and each is 50% of the grade. Paper 1 (1CH0/1F and 1CH0/1H) covers topics 1 to 5 (key concepts, states of matter and mixtures, chemical changes, extracting metals and equilibria, and separate chemistry 1). Paper 2 (1CH0/2F and 1CH0/2H) covers topic 1 again plus topics 6 to 9 (groups in the periodic table, rates and energy changes, fuels and Earth science, and separate chemistry 2). Each paper has multiple choice, short answer, calculation and extended open-response questions.
How much maths is in Edexcel GCSE Chemistry?
At least 20% of the marks assess mathematical skills, the highest of the three sciences. Expect relative formula mass, percentage by mass, empirical formulae, reacting-mass calculations, concentration in g/dm3 and mol/dm3, moles, percentage yield and atom economy, gas volumes, balancing equations, standard form, ratios and rearranging. A calculator is allowed in both papers. The mole-based calculations and titration and gas-volume work are Higher tier and separate chemistry.
What are the core practicals in Edexcel GCSE Chemistry?
There are eight core practicals, for example investigating inks by chromatography and distillation, preparing copper sulfate crystals, an acid-alkali titration, electrolysis of copper sulfate solution, the rate of reaction by colour change and by gas volume, and investigating temperature changes. They are not assessed in a separate lab exam, but practical skills are worth a significant share of the written-exam marks, so learn the apparatus, variables, method, results and safety for each.
What is separate chemistry in Edexcel GCSE Chemistry?
Students taking GCSE Chemistry as a separate science cover all nine topics, including topic 5 (separate chemistry 1) and topic 9 (separate chemistry 2). Topic 5 adds transition metals, alloys and corrosion plus extended quantitative analysis (titrations, mol/dm3, gas volumes, yield and atom economy). Topic 9 adds qualitative tests for ions, alcohols and carboxylic acids, and polymers and materials. Students taking Combined Science do not sit topics 5 and 9 and some statements within other topics.
How should I structure my Edexcel GCSE Chemistry revision?
Work topic by topic against the numbered specification statements (1.1, 1.2, and so on), because questions are written directly from them. Master the calculations in topic 1 early because they reappear across the course, learn the core-practical methods, and practise balancing symbol, ionic and half-equations. Drill the six-mark extended-response questions, separate the Paper 1 and Paper 2 content when you revise, and finish with full timed past papers for each paper.
How does Edexcel GCSE Chemistry compare to other exam boards?
All GCSE Chemistry specifications (Edexcel, AQA, OCR) follow the same national subject content, so atomic structure, bonding, quantitative chemistry, the groups, organic chemistry and the atmosphere are broadly the same everywhere, and all are tiered. Edexcel's distinctive features are its nine-topic structure with separate chemistry 1 and 2, its eight core practicals and its question styles. Always revise from the current Edexcel specification and Edexcel past papers.
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.