Pure substance Q consists of small molecules. A student heats liquid Q at a constant rate.
| Time in seconds | Temperature in ∘C^\circ\text{C}∘C |
|---|---|
| 0 | 24 |
| 20 | 42 |
| 40 | 60 |
| 60 | 68 |
| 80 | 68 |
| 100 | 68 |
State the boiling point of substance Q.
Explain why the temperature of substance Q does not increase between 60 seconds and 100 seconds.
As substance Q boils, describe how the separation of its molecules changes and state what happens to the covalent bonds within each molecule.
84 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.