The table gives the melting point and the electrical conductivity of four substances. Which substance has a giant covalent structure?
Table: The melting point and the electrical conductivity of four substances
| Substance | Melting point in ∘C^\circ\text{C}∘C | Conducts electricity when solid | Conducts electricity when molten |
|---|---|---|---|
| E | 660 | yes | yes |
| F | -7 | no | no |
| G | 1610 | no | no |
| H | 801 | no | yes |
E
F
G
H
42 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.