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5.3 Equilibria

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Question 21
H

Calcium carbonate is heated in a sealed container until equilibrium is reached.

CaCO3(s)⇌CaO(s)+CO2(g) \mathrm{CaCO_{3}(s) \rightleftharpoons CaO(s) + CO_{2}(g)} CaCO3​(s)⇌CaO(s)+CO2​(g)

The forward reaction is endothermic.

What is the effect on the amount of calcium oxide at equilibrium of increasing the temperature, and of increasing the pressure?

[1]
A

Increasing temperature: increases; increasing pressure: no change

B

Increasing temperature: decreases; increasing pressure: decreases

C

Increasing temperature: decreases; increasing pressure: increases

D

Increasing temperature: increases; increasing pressure: decreases

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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