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6.2 Reversible reactions and dynamic equilibrium

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Question 36

Phosphorus pentachloride is formed in a sealed container.

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)

The table shows the percentage equilibrium yield of phosphorus pentachloride at a constant temperature.

Pressure in kPaPercentage equilibrium yield
10028
20040
40053

A student concludes that doubling the pressure doubles the percentage equilibrium yield because phosphorus pentachloride is a gas.

Evaluate the student's conclusion.

[4]
Markscheme

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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