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5.2 Controlling reactions

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Question 17

A student compares the breakdown of equal amounts of starch at the same temperature. Amylase is added to one sample but not to the other.

Which observation would show that amylase acts as a catalyst?

[1]
A

Sugar is formed sooner when amylase is present, and the amylase can be used again.

B

Sugar is formed in the same time with or without amylase, and the amylase can be used again.

C

More sugar is formed when amylase is present, and the amylase is used up.

D

Sugar is formed sooner when amylase is present, and the amylase is used up.

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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