specification overview
Edexcel International GCSE Chemistry (4CH1) is a linear single-tier qualification covering 4 topic areas: principles of chemistry, inorganic chemistry, physical chemistry and organic chemistry. Two papers are sat at the end of the course; graded on the 9-1 scale. No separate Foundation/Higher tier, all students take the same papers.
subject content
1. Principles of chemistry
Papers 1, 2- States of matter, atomic structure, periodic table
- Chemical formulae, equations and calculations
- Ionic bonding, covalent bonding, metallic bonding
2. Inorganic chemistry
Papers 1, 2- Group 1 (alkali metals), Group 7 (halogens) and gases in the atmosphere
- Reactivity of metals, acid-base and redox reactions
- Tests for cations, anions and gases
3. Physical chemistry
Papers 1, 2- Energetics (endothermic and exothermic)
- Rates of reaction; reversible reactions and equilibrium
4. Organic chemistry
Papers 1, 2- Crude oil and fractional distillation
- Alkanes, alkenes, alcohols, carboxylic acids and esters
- Synthetic polymers and condensation polymerisation
assessment structure
| Paper | What's assessed | Length | Marks | Weight | Question types |
|---|---|---|---|---|---|
| Paper 1 | Topics 1-4 | 2h | 110 | 61.1% | Multiple-choice, short-answer, extended writing and calculations |
| Paper 2 | Topics 1-4 (all sections, including bold 'C' Chemistry-only content) | 1h 15m | 70 | 38.9% | Multiple-choice, short-answer, extended writing and calculations |
Both papers cover all four topics; the difference is depth, not topic split. Paper 2 also assesses the bold 'C' Chemistry-only spec statements at greater depth. Single-tier: all students take both papers.
assessment objectives
| AO | What it means | Overall |
|---|---|---|
| AO1 | Knowledge and understanding of chemistry. | 38-42% |
| AO2 | Application of knowledge and understanding, analysis and evaluation of chemistry. | 38-42% |
| AO3 | Experimental skills, analysis and evaluation of data and methods in chemistry. | 19-21% |
key tips for success
Master moles and calculations
IGCSE Chemistry rewards precise moles calculations. Practise moles = mass/Mr, concentration, gas volume, percentage yield until automatic.
Learn ionic tests
Tests for cations (flame tests, precipitation), anions (BaCl2, AgNO3) and gases (litmus, splint, limewater). Learn each test, reagent and observation.
Master the Haber process
Ammonia and the Haber process (within the inorganic chemistry topic) recurs on both papers. Learn the Haber process conditions (temperature, pressure, catalyst) with reasoning.
Practise past papers
Edexcel IGCSE Chemistry has years of past papers. Do timed practice from year 10.
Build a definition bank
Precise definitions matter (mole, empirical formula, dynamic equilibrium). Learn word-for-word from the syllabus.
No tier decision
Single-tier means all students take the same papers with grades 9-1 available. Focus on maximising your score.
Where to next
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