A solid, P, decomposes when heated.
P(s)⇌Q(s)+R(g) \mathrm{P(s) \rightleftharpoons Q(s) + R(g)} P(s)⇌Q(s)+R(g)Equal masses of P are heated at the same constant temperature in two containers. One container is closed and the other is open. The student does not record which container is which.
The table shows the total mass of each container and its contents.
| Time in minutes | Mass of container A and contents in g | Mass of container B and contents in g |
|---|---|---|
| 0 | 42.80 | 42.80 |
| 2 | 42.80 | 42.51 |
| 4 | 42.80 | 42.30 |
| 6 | 42.80 | 42.16 |
Explain which container can reach dynamic equilibrium. Predict what will happen to P in the other container if heating continues for long enough.
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.