IGCSE Chemistry Revision Guide: Topics, Past Papers and Exam Tips
How to revise for IGCSE Chemistry — high-frequency topics, command word technique, practical skills, and past paper strategy for Cambridge and Edexcel IGCSE Chemistry.
IGCSE Chemistry rewards students who combine solid content knowledge with precise exam technique. Command words matter, diagrams earn marks, and past papers expose the exact phrasing examiners want. This guide covers the highest-yield topics, how to revise effectively, and the mistakes that cost grades.
High-frequency IGCSE Chemistry topics
Prioritise these areas (they appear in almost every paper):
- Atomic structure and bonding — ionic, covalent, metallic; dot-and-cross diagrams
- Stoichiometry — moles, reacting masses, concentration calculations
- Electrolysis — products at electrodes, half equations
- Acids, bases, and salts — neutralisation, titration, salt preparation
- Organic chemistry — alkanes, alkenes, alcohols, polymers
- Energetics — exothermic/endothermic, energy profile diagrams
- Rates of reaction — collision theory, catalysts, graph interpretation
Command words that decide your grade
Chemistry mark schemes are strict about language:
- State / Name — short, factual answers
- Describe — say what happens, step by step
- Explain — give the reason (link structure to property)
- Calculate — show working, include units, round correctly
Practise writing one paragraph per command word from memory, then check against mark schemes.
Practical and alternative-to-practical skills
Even if you don't sit a practical exam, questions test practical understanding:
- Reading apparatus diagrams
- Identifying errors in methods
- Interpreting data tables and graphs
- Suggesting improvements to experiments
Use past paper practical-style questions (Paper 6 for Cambridge) even if you're not sitting the practical component.
Past paper plan
| Week | Focus |
|---|---|
| 1–3 | Topical questions on bonding, moles, acids |
| 4–5 | Organic + energetics topical drills |
| 6–8 | Full timed papers + mark scheme review |
See our past papers guide for the full method.
Common mistakes
- Vague explanations ("because it's stronger") without linking to structure
- Missing state symbols in equations
- Forgetting units in calculations
- Not drawing diagrams when they earn marks
Revise smarter with AI
Upload your Chemistry notes to generate MCQs and flashcards, then use gettopmarks to explain topics you're stuck on — in mark-scheme language, calibrated to Cambridge and Edexcel. Combine with active recall and our IGCSE revision plan.