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Before you revise a single chemical equation, you need to understand exactly what you are preparing for. Students who know the exam inside out make smarter revision choices, manage their time better in the exam hall, and avoid the costly mistake of revising the wrong content for the wrong paper.
This lesson breaks down the Edexcel GCSE Chemistry qualification (1CH0) so you know precisely what to expect on exam day.
| Feature | Paper 1 (1CH0/1F or 1H) | Paper 2 (1CH0/2F or 2H) |
|---|---|---|
| Topics tested | Topics 1–5 | Topics 6–9 plus synoptic questions from Topics 1–5 |
| Duration | 1 hour 45 minutes | 1 hour 45 minutes |
| Total marks | 100 | 100 |
| Percentage of GCSE | 50% | 50% |
| Tiers available | Foundation and Higher | Foundation and Higher |
Both papers carry equal weight. Your final grade is determined by combining your marks from both papers.
Paper 1 examines the first five topics of the specification:
| Topic | Title | Key Content Areas |
|---|---|---|
| Topic 1 | Key Concepts in Chemistry | Atomic structure, the periodic table, ionic bonding, covalent bonding, metallic bonding, states of matter |
| Topic 2 | States of Matter and Mixtures | States of matter, mixtures, filtration, distillation, chromatography |
| Topic 3 | Chemical Changes | Reactivity series, extraction of metals, acids and alkalis, neutralisation, electrolysis |
| Topic 4 | Extracting Metals and Equilibria | Obtaining and using metals, reversible reactions, dynamic equilibria (Higher only) |
| Topic 5 | Separate Chemistry 1 | Transition metals, alloys, corrosion, nanoparticles, bulk properties |
Exam tip: Paper 1 questions will only test Topics 1–5. You do not need to worry about Topics 6–9 when sitting Paper 1.
Paper 2 covers Topics 6–9, but crucially it also includes synoptic questions that can draw on any topic from 1–9.
| Topic | Title | Key Content Areas |
|---|---|---|
| Topic 6 | Groups in the Periodic Table | Group 1, Group 7, Group 0 |
| Topic 7 | Rates of Reaction and Energy Changes | Rate of reaction, factors affecting rate, catalysts, exothermic and endothermic reactions, bond energies |
| Topic 8 | Fuels and Earth Science | Crude oil, hydrocarbons, combustion, fractional distillation, the Earth's atmosphere, climate change |
| Topic 9 | Separate Chemistry 2 | Quantitative analysis, moles, titrations, percentage yield, atom economy, chemical cells, fuel cells |
Exam tip: Because Paper 2 includes synoptic questions from Topics 1–5, you must revise all nine topics before Paper 2. Do not assume you can forget Topics 1–5 after sitting Paper 1.
Synoptic questions require you to draw together knowledge from different parts of the specification. They test your ability to make connections between topics.
For example, a Paper 2 question about rates of reaction (Topic 7) might require you to explain collision theory using your knowledge of particles and bonding (Topic 1). Or a question about electrolysis of brine (Topic 6/3) might link to ionic bonding from Topic 1.
Synoptic questions frequently appear in the longer, higher-mark questions — especially the 6-mark extended response questions on Paper 2.
You will sit either Foundation or Higher — not both. Your teacher will decide which tier is appropriate.
| Tier | Code | Grade Range | Key Differences |
|---|---|---|---|
| Foundation | 1CH0/1F and 2F | Grades 1–5 | More scaffolding in questions; some Higher-only content is not examined; mathematical demand is lower |
| Higher | 1CH0/1H and 2H | Grades 4–9 | Less scaffolding; includes Higher-only content; greater mathematical demand; more open-ended questions |
If you sit Foundation, the maximum grade is 5. If you sit Higher, the lowest grade awarded is 4 (though a "safety net" grade 3 may be given if your mark falls just below the grade 4 boundary).
Exam tip: Higher-only content includes topics like dynamic equilibria, moles calculations involving limiting reagents, and some quantitative analysis. If you are sitting Higher, make sure you can identify which content is Higher-only in the specification.
Every question on both papers targets one or more assessment objectives (AOs):
| AO | Description | Approximate Weighting |
|---|---|---|
| AO1 | Demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures | ~40% |
| AO2 | Apply knowledge and understanding of scientific ideas, processes, techniques and procedures in new contexts | ~40% |
| AO3 | Analyse information and ideas to interpret and evaluate, make judgements and draw conclusions, and develop and improve experimental procedures | ~20% |
This means roughly 60% of the marks require more than simple recall. You must be able to apply your knowledge and analyse data.
Each paper contains a mixture of question types:
Approximately 20% of the total marks across both papers require mathematical skills. That is around 20 marks per paper — roughly 40 marks overall.
The maths content includes:
Exam tip: Mathematical questions are among the most reliable marks available — the answer is either right or wrong. If you practise calculations thoroughly, these are marks you can depend on.
At least 15% of the marks on each paper assess practical skills. There is no separate practical exam — practical knowledge is tested entirely through written questions on Paper 1 and Paper 2.
These questions are based on the core practicals in the specification and test your ability to:
You do not need to have physically carried out every practical, but you must be able to describe and evaluate them as if you had.
With 100 marks in 105 minutes, you have roughly 1 minute per mark plus 5 minutes spare.
graph LR
A[Start: 105 minutes] --> B[100 marks to answer]
B --> C[~1 min per mark]
C --> D[5 min buffer for checking]
D --> E[6-mark Qs: spend 6–7 min each]
E --> F[1-mark Qs: spend 1 min max]
Practical time management tips:
Exam tip: Keep a rough eye on the clock. After 30 minutes, you should have earned approximately 30 marks' worth of answers. If you are behind, pick up the pace on lower-mark questions.
graph TD
A[Paper Structure] --> B[Paper 1: Topics 1-5]
A --> C[Paper 2: Topics 6-9 + Synoptic]
B --> D[100 marks, 1h45m]
C --> E[100 marks, 1h45m]
D --> F[AO1 ~40% / AO2 ~40% / AO3 ~20%]
E --> F
F --> G[Multiple Choice + Short Answer + Calculations + 6-mark Extended]