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5.2 Controlling reactions

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Question 27
F

The activation energy of a reaction without a catalyst is 180 kJ/mol. A catalyst lowers the activation energy by 60 kJ/mol.

The reaction is endothermic. The products have 40 kJ/mol more energy than the reactants.

On the reaction profile for the catalysed reaction, how much higher in energy is the peak than the products?

[1]
A

80 kJ/mol80\,\mathrm{kJ/mol}80kJ/mol

B

120 kJ/mol120\,\mathrm{kJ/mol}120kJ/mol

C

140 kJ/mol140\,\mathrm{kJ/mol}140kJ/mol

D

160 kJ/mol160\,\mathrm{kJ/mol}160kJ/mol

Markscheme

5.2 Controlling reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.2 Controlling reactions

56 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.

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