A pure solid is heated at a constant rate. Its temperature is recorded every minute.
| Time / min | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature / ∘C^\circ\mathrm{C}∘C | 2 | 9 | 16 | 16 | 16 | 16 | 41 | 66 | 91 | 116 | 116 |
Statement 1: at 9 minutes the substance is entirely a gas
Statement 2: at 4 minutes both solid and liquid are present
Statement 3: between 2 and 5 minutes energy is taken in but the temperature does not rise
Which statements are correct?
2 only
1 and 2 only
2 and 3 only
1, 2 and 3
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.