The table shows the melting points and boiling points of four substances.
| Substance | Melting point / °C | Boiling point / °C |
|---|---|---|
| oxygen | −218 | −183 |
| ethanol | −114 | 78 |
| mercury | −39 | 357 |
| sodium chloride | 801 | 1413 |
Give the state of ethanol at 20 °C.
Give the name of the substance that is a gas at 20 °C.
Give the state of mercury at −50 °C.
Give the name of the substance with the highest boiling point.
Sodium chloride is heated to 801 °C. Name the change of state that happens at this temperature.
Describe how the arrangement of the particles changes when solid sodium chloride changes into a liquid.
53 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.