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6.2 Reversible reactions and dynamic equilibrium

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Question 35

Two reversible reactions are carried out in separate closed containers.

Reaction 1:

PCl3(g)+Cl2(g)⇌PCl5(g)\text{PCl}_3\text{(g)} + \text{Cl}_2\text{(g)} \rightleftharpoons \text{PCl}_5\text{(g)}PCl3​(g)+Cl2​(g)⇌PCl5​(g)

Reaction 2:

2CO2(g)⇌2CO(g)+O2(g)2\text{CO}_2\text{(g)} \rightleftharpoons 2\text{CO(g)} + \text{O}_2\text{(g)}2CO2​(g)⇌2CO(g)+O2​(g)

Each mixture is allowed to reach equilibrium. The pressure in each container is then increased at constant temperature, and equilibrium is re-established.

A chemist claims that increasing the pressure will increase the equilibrium yield of phosphorus pentachloride in Reaction 1 but decrease the equilibrium yield of oxygen in Reaction 2.

Evaluate the chemist's claim.

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6.2 Reversible reactions and dynamic equilibrium Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Reversible reactions and dynamic equilibrium

109 exam-style questions on AQA GCSE Chemistry 6.2 Reversible reactions and dynamic equilibrium, covering 6.2.1 Reversible reactions, 6.2.2 Energy changes and reversible reactions, 6.2.3 Equilibrium, 6.2.4 The effect of changing conditions on equilibrium, 6.2.5 The effect of changing concentration, 6.2.6 The effect of temperature changes on equilibrium, and 6.2.7 The effect of pressure changes on equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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