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5.2 Controlling reactions

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Question 8

Amylase in saliva catalyses the breakdown of starch into sugars.

The products have 35 kJ/mol less energy than the reactants. For the pathway involving amylase, the highest energy level is 95 kJ/mol above the products. Without amylase, the highest energy level is a further 55 kJ/mol higher.

What is the activation energy for the reaction without amylase?

[1]
A

60 kJ/mol60\,\mathrm{kJ/mol}60kJ/mol

B

95 kJ/mol95\,\mathrm{kJ/mol}95kJ/mol

C

115 kJ/mol115\,\mathrm{kJ/mol}115kJ/mol

D

150 kJ/mol150\,\mathrm{kJ/mol}150kJ/mol

Markscheme

5.2 Controlling reactions Questions

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

122 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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