A manufacturer is choosing between two materials for an insulating support in an electric furnace.
| Material | Melting point (∘C^\circ\mathrm{C}∘C) | Conducts electricity when solid? | Conducts electricity when molten? |
|---|---|---|---|
| P | 790 | No | Yes |
| Q | 1680 | No | No |
Use the data in the table to identify the type of structure in P and in Q.
Explain your answers.
The support operates at 1200 ∘C1200\,^\circ\mathrm{C}1200∘C. It must remain solid and must not conduct electricity.
Which material should be used? Explain your answer.
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.