The table shows the melting points and boiling points of four substances.
| Substance | Melting point (∘C^\circ\mathrm{C}∘C) | Boiling point (∘C^\circ\mathrm{C}∘C) |
|---|---|---|
| W | -7 | 59 |
| X | -101 | -34 |
| Y | 114 | 184 |
| Z | -220 | -188 |
Which statement is correct?
At −50 ∘C-50\,^\circ\mathrm{C}−50∘C, X is a liquid and W is a solid.
At 25 ∘C25\,^\circ\mathrm{C}25∘C, Y has enough energy to melt but not enough energy to boil.
At −200 ∘C-200\,^\circ\mathrm{C}−200∘C, Z is a gas.
W has a higher boiling point than X and a lower melting point than Z.
48 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.