A researcher makes two tracks, P and Q, from different forms of carbon. The tracks have the same dimensions and are tested using the same potential difference.
| Track | Bonding and arrangement of carbon atoms | Current in the track in A |
|---|---|---|
| P | Each carbon atom is covalently bonded to three others in flat layers. The layers run from one electrode to the other. | 0.75 |
| Q | Each carbon atom is covalently bonded to four others in a three-dimensional network. | 0.00 |
The researcher makes a second track from material P. In this track, the layers are perpendicular to the direction between the electrodes. The second track has the same dimensions as the first P track and is tested using the same potential difference.
Explain the results in the table and how the current in the second track made from P would compare with 0.75 A.
122 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.