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3.2 Energetics

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Question 32

Water is split into hydrogen and oxygen in the endothermic reaction

2H2O→2H2+O2 2\text{H}_2\text{O} \rightarrow 2\text{H}_2 + \text{O}_2 2H2​O→2H2​+O2​

A student proposes these energy levels for its reaction profile.

Part of reaction profileEnergy in kJ/mol\mathrm{kJ/mol}kJ/mol
Reactants100
Products582
Peak550
a.

Calculate the overall energy change and the activation energy shown by the proposed energy levels.

[2]
b.

Explain why the proposed energy levels cannot represent this reaction. State how the energy at the peak must be changed.

[2]
Markscheme

3.2 Energetics Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Energetics

106 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.

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