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6.2 Reversible reactions and dynamic equilibrium

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Question 9
H

Ammonia is manufactured using the reaction shown. The forward reaction is exothermic. A temperature of about 450 ∘C450\ ^\circ\text{C}450 ∘C is used in industry.

N2(g)+3H2(g)⇌2NH3(g)\text{N}_2(\text{g}) + 3\text{H}_2(\text{g}) \rightleftharpoons 2\text{NH}_3(\text{g})N2​(g)+3H2​(g)⇌2NH3​(g)

a.

Explain why the yield of ammonia at equilibrium is lower at 450 ∘C450\ ^\circ\text{C}450 ∘C than it is at 350 ∘C350\ ^\circ\text{C}350 ∘C.

[3]
b.

Explain why a temperature of 450 ∘C450\ ^\circ\text{C}450 ∘C is used instead of 350 ∘C350\ ^\circ\text{C}350 ∘C.

[2]
Markscheme

6.2 Reversible reactions and dynamic equilibrium Questions

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

40 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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