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#101

4.5.2 Reaction profiles and activation energy

Paper 1 · Higher combined

What you need to know

  • (Key facts / definitions / equations for this spec point)

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Self-assessment (checklist)

  • I can write half equations to represent reactions at
  • I can explain what is meant by ‘conservation of energy’
  • I can describe the transfer of energy in an exothermic
  • I can give some examples of exothermic reactions.
  • I can describe some everyday uses of exothermic
  • I can describe the transfer of energy in an endothermic
  • I can give some examples of endothermic reactions.
  • I can describe an everyday use of endothermic
  • I can distinguish between exothermic and endothermic

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)

  1. Define the key term(s) for this mini-topic.
  2. Explain a typical property/result using particle/bonding ideas.
  3. Do a short calculation or interpretation step relevant to this mini-topic.