A reversible reaction takes place in a closed container at constant temperature.
P(aq)⇌Q(aq) \mathrm{P(aq) \rightleftharpoons Q(aq)} P(aq)⇌Q(aq)The table shows concentrations measured after the reaction has reached equilibrium.
| Time (min) | Concentration of P (mol/dm³) | Concentration of Q (mol/dm³) |
|---|---|---|
| 20 | 0.12 | 0.36 |
| 30 | 0.12 | 0.36 |
A student says:
“Q has three times the concentration of P, so the forward reaction is three times faster than the reverse reaction. The unchanged concentrations show that the particles have stopped reacting.”
Evaluate this statement.
124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.