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5.3 Equilibria

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Question 32

A sealed cylinder fitted with a movable piston contains carbon monoxide, carbon dioxide and solid carbon at dynamic equilibrium.

2CO(g)⇌C(s)+CO2(g) \mathrm{2CO(g) \rightleftharpoons C(s) + CO_{2}(g)} 2CO(g)⇌C(s)+CO2​(g)

The piston is pulled out so that the pressure falls. The temperature is kept the same.

Which prediction about the position of equilibrium is correct?

[1]
A

It moves to the right, because there are fewer gas molecules on the right.

B

It does not move, because the balancing numbers add up to two on each side.

C

It moves to the right, because there are more different substances on the right.

D

It moves to the left, because there are more gas molecules on the left.

Markscheme

5.3 Equilibria Questions

  1. GCSE
  2. /Chemistry
  3. /5.3 Equilibria

124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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