A student heats a pure solid at a constant rate. The simple particle model represents the particles as solid spheres.
| Energy supplied in kJ | Temperature in °C | State of the substance |
|---|---|---|
| 12 | 65 | solid and liquid |
| 18 | 65 | solid and liquid |
| 24 | 80 | liquid |
Using the data, explain one limitation of the simple particle model when it is used to explain the change from 12 kJ to 18 kJ. Suggest why the temperature increases from 18 kJ to 24 kJ.
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.