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5.2 Controlling reactions

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Question 39

A student measures the time taken for a reaction mixture to produce 30 cm3 of gas. At 40 ∘C40\,^\circ\mathrm{C}40∘C, this takes 18 s.

The rate of this reaction halves for every 10 ∘C10\,^\circ\mathrm{C}10∘C fall in temperature.

The student repeats the experiment at a lower temperature. This time, it takes 72 s to produce the same volume of gas.

At what temperature was the experiment repeated?

[1]
A

0 ∘C0\,^\circ\mathrm{C}0∘C

B

20 ∘C20\,^\circ\mathrm{C}20∘C

C

30 ∘C30\,^\circ\mathrm{C}30∘C

D

10 ∘C10\,^\circ\mathrm{C}10∘C

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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