A reversible reaction takes place at constant temperature.
A(s)⇌B(s)+C(g)\text{A(s)} \rightleftharpoons \text{B(s)} + \text{C(g)}A(s)⇌B(s)+C(g)
Equal masses of A are placed in two identical vessels.
The mass of A in each vessel is measured at regular intervals.
| Time in minutes | Mass of A in vessel P in g | Mass of A in vessel Q in g |
|---|---|---|
| 0 | 12.0 | 12.0 |
| 5 | 8.8 | 8.5 |
| 10 | 7.0 | 5.7 |
| 15 | 6.1 | 3.4 |
| 20 | 6.1 | 1.8 |
| 25 | 6.1 | 0.9 |
Which vessel has reached dynamic equilibrium by 15 minutes?
Explain your answer.
At 25 minutes, the tap on vessel P is opened and gas C is allowed to escape.
Predict how the mass of A will change. Explain your answer.
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.