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This lesson covers how changing the temperature affects the rate of reaction using collision theory, as required by the Edexcel GCSE Combined Science specification (1SC0). Temperature is arguably the most important factor — it affects both the frequency and the energy of collisions.
When the temperature is increased:
Exam Tip: This is one of the most commonly asked 4–6 mark questions. You must give both reasons: (1) more frequent collisions AND (2) a greater proportion of particles have energy ≥ Eₐ. Giving only one reason limits you to a maximum of half the marks.
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