A student heats three different substances in an oven set to 100 ∘C100\ ^\circ\text{C}100 ∘C and records their states of matter at three stages of the experiment.
| Substance | Before heating | At 100 ∘C100\ ^\circ\text{C}100 ∘C | After cooling to room temperature |
|---|---|---|---|
| Glass rod | Solid | Solid | Solid |
| Beeswax | Solid | Liquid | Solid |
| Pancake batter | Liquid | Solid | Solid |
Give a reason why the glass rod did not change state during this experiment.
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.