The table shows the melting points and boiling points of three substances.
| Substance | Melting point (∘C^\circ\mathrm{C}∘C) | Boiling point (∘C^\circ\mathrm{C}∘C) |
|---|---|---|
| P | -95 | 56 |
| Q | 44 | 280 |
| R | -116 | 35 |
At which temperature is one substance a solid, one a liquid and one a gas?
30 ∘C30\,^\circ\mathrm{C}30∘C
40 ∘C40\,^\circ\mathrm{C}40∘C
50 ∘C50\,^\circ\mathrm{C}50∘C
60 ∘C60\,^\circ\mathrm{C}60∘C
48 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.