The physical properties of four solid substances, WWW, XXX, YYY, and ZZZ, are shown in the table below:
| Substance | Melting point / K\text{K}K | Electrical conductivity as a solid | Electrical conductivity as a liquid |
|---|---|---|---|
| WWW | 387 | Poor | Poor |
| XXX | 1074 | Poor | Good |
| YYY | 1811 | Good | Good |
| ZZZ | 1986 | Poor | Poor |
In which substance are covalent bonds broken when the solid melts?
WWW
XXX
YYY
ZZZ
54 exam-style questions on AQA A Level Chemistry Bonding, covering Ionic bonding, Nature of covalent and dative covalent bonds, Metallic bonding, Bonding and physical properties, Shapes of simple molecules and ions, Bond polarity, and Forces between molecules. Each one has a worked solution and a mark scheme showing where the marks go.