The table shows some properties of four substances, W, X, Y and Z.
| Substance | Melting point (∘C^\circ\mathrm{C}∘C) | Conducts electricity when solid? | Conducts electricity when molten? |
|---|---|---|---|
| W | 1710 | No | No |
| X | 2852 | No | Yes |
| Y | 44 | No | No |
| Z | 660 | Yes | Yes |
Which row correctly identifies the structures of two of the substances?
W is ionic and Z is metallic.
W is giant covalent and X is ionic.
X is giant covalent and Y is simple molecular.
Y is ionic and Z is metallic.
60 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.