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6.2 Reversible reactions and dynamic equilibrium

6.2 Reversible reactions and dynamic equilibrium

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Question 9

This question is about reversible reactions.

a.

Anhydrous copper(II) sulfate (white powder) reacts with water to produce hydrated copper(II) sulfate (blue crystals). Hydrated copper(II) sulfate can be heated to turn back into anhydrous copper(II) sulfate and water vapor.

Which two words describe the reaction of anhydrous copper(II) sulfate with water?

  • Combustion
  • Exothermic
  • Neutralisation
  • Precipitation
  • Reversible
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b.

In a closed system, nitrogen dioxide gas (NO2\text{NO}_2NO2​) exists in equilibrium with dinitrogen tetroxide gas (N2O4\text{N}_2\text{O}_4N2​O4​).

The equation for this reversible reaction is:

2NO2(g)⇌N2O4(g) 2\text{NO}_2\text{(g)} \rightleftharpoons \text{N}_2\text{O}_4\text{(g)} 2NO2​(g)⇌N2​O4​(g)

Which sentence describes this reaction when it has reached dynamic equilibrium?

  • The rate of the forward reaction is greater than the rate of the reverse reaction.
  • The forward and reverse reactions occur at the same rate.
  • The rate of the forward reaction is less than the rate of the reverse reaction.
[1]
Markscheme

6.2 Reversible reactions and dynamic equilibrium Questions

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

21 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 (HT only), 6.2.5 The effect of changing concentration (HT only), 6.2.6 The effect of temperature changes on equilibrium (HT only), and 6.2.7 The effect of pressure changes on equilibrium (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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