#118
4.6.1.3 Collision theory and activation energy
Paper 2 · Higher combined
Spec reference: 4.6.1.3 (under 4.6.1).
What you need to know
- volcanic eruptions were responsible
KO match: energy reaching the Earth and
Support videos
- FreeScienceLessons (topic playlist): (use links below)
- PMT videos hub (Rate & extent): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/rate-and-extent-of-chemical-change/
Self-assessment (checklist)
- I can draw and interpret reaction profiles to show the
Key steps (method)
- Identify what the question is testing and use precise chemistry vocabulary.
- If it’s a calculation: write the equation/formula first, then substitute carefully.
Common mistakes
- Missing units/state symbols when asked.
- Giving a statement without linking cause → effect.
Exam-style questions (quick)
- Define the key term(s) for this point in the spec.
- Explain a typical property/result using particle/bonding ideas.
- Do a short calculation or interpretation step relevant to this point.
Practice questions
- PMT: Rate & extent (questions + notes): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/rate-and-extent-of-chemical-change/