Samples of four substances are cooled from 25 ∘C25\,^\circ\mathrm{C}25∘C to −50 ∘C-50\,^\circ\mathrm{C}−50∘C.
| Substance | Melting point / ∘C^\circ\mathrm{C}∘C | Boiling point / ∘C^\circ\mathrm{C}∘C |
|---|---|---|
| J | -40 | 5 |
| K | -60 | 10 |
| L | -30 | 60 |
| M | -100 | -60 |
Which substance changes state twice during the cooling?
J
K
L
M
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.