Two solid materials, P and Q, contain only carbon atoms. The same potential difference is applied across samples of equal dimensions.
| Material | Number of covalent bonds formed by each carbon atom | Current in mA |
|---|---|---|
| P | 4 | 0.0 |
| Q | 3 | 18.0 |
Explain the difference between the current readings for P and Q.
68 exam-style questions on AQA GCSE Chemistry 2.3 Structure and bonding of carbon, covering 2.3.1 Diamond, 2.3.2 Graphite, and 2.3.3 Graphene and fullerenes. Each one has a worked solution and a mark scheme showing where the marks go.