A laboratory cools four pure materials from 90 ∘C90\,^\circ\mathrm{C}90∘C to 10 ∘C10\,^\circ\mathrm{C}10∘C.
| Material | Melting point (∘C^\circ\mathrm{C}∘C) | Boiling point (∘C^\circ\mathrm{C}∘C) |
|---|---|---|
| W | 18 | 72 |
| X | −15 | 60 |
| Y | 30 | 110 |
| Z | −40 | 5 |
Which material is a gas at the start of the cooling and a solid at the end?
Material W
Material Y
Material Z
Material X
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.