The table shows some properties of four substances, P, Q, R and S.
| Substance | Melting point (∘C^\circ\mathrm{C}∘C) | Conducts electricity when solid | Conducts electricity when molten |
|---|---|---|---|
| P | 1710 | no | no |
| Q | 2852 | no | yes |
| R | 1085 | yes | yes |
| S | 17 | no | no |
Statement 1: Q has a giant ionic structure
Statement 2: P and S have the same type of structure, because neither conducts electricity
Statement 3: R contains delocalised electrons
Which statements are correct?
1 only
2 only
1 and 2 only
1 and 3 only
48 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.