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5.3 Equilibria

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Question 10
F

Calcium carbonate is heated in a sealed steel container at a constant high temperature.

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

The pressure of carbon dioxide rises at first and then stays constant, even though some calcium carbonate is still present.

Which explanation is correct?

[1]
A

Carbon dioxide is made at the same rate as it reacts with calcium oxide.

B

The forward reaction stops because carbon dioxide cannot escape.

C

Calcium oxide coats the calcium carbonate so no more can react.

D

The reverse reaction is now faster than the forward reaction.

Markscheme

5.3 Equilibria Questions

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

47 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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