#160
4.9.1 Composition and evolution of the Earth’s atmosphere
Paper 2 · Higher combined
What you need to know
- (Key facts / definitions / equations for this spec point)
Support videos
- FreeScienceLessons (topic playlist): (use links below)
- PMT videos hub (Atmosphere): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/chemistry-of-atmosphere/
Self-assessment (checklist)
- I can interpret evidence and evaluate different
Key steps (method)
- Identify what the question is testing (definition / calculation / explanation).
- Use the correct chemistry vocabulary and link cause → effect.
- If it’s a calculation: write the equation/formula first, then substitute carefully.
Common mistakes
- Giving a fact without linking it to the question.
- Missing units / state symbols when asked.
- Not showing enough working to score method marks.
Exam-style questions (quick)
- Define the key term(s) for this mini-topic.
- Explain a typical property/result using particle/bonding ideas.
- Do a short calculation or interpretation step relevant to this mini-topic.
Practice questions
- PMT: Atmosphere (questions + notes): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/chemistry-of-atmosphere/
Extra knowledge organisers
Revision links
- (Add links)