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5.2 Controlling reactions

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Question 21
F

Powdered zinc reacts faster with dilute sulfuric acid than the same mass of zinc lumps. The temperature is the same.

Statement 1: The powder has a larger surface area to volume ratio, so collisions with acid particles are more frequent.

Statement 2: The acid particles collide with the powder with more energy.

Statement 3: A greater proportion of the collisions are successful when the powder is used.

Which statements help to explain why the powder reacts faster?

[1]
A

1 only

B

1 and 2 only

C

1 and 3 only

D

1, 2 and 3

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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