Substance X changes reversibly into substance Y in a closed reaction chamber.
X ⇌ Y
The table shows measurements taken at 60 seconds.
| Rate of forward reaction in mmol/s | Rate of reverse reaction in mmol/s | Amount of Y in mmol |
|---|---|---|
| 0.40 | 0.40 | 35 |
No conditions are changed after 60 seconds.
A student says, ‘The amount of Y is not changing at 60 seconds, so both reactions must have stopped.’
Explain, using the data, why the student's conclusion is wrong.
Give the amount of Y in the reaction chamber at 100 seconds.
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.