Copper is used to make electrical wires.
Potassium iodide is an ionic compound with a melting point of 681 °C.
Describe the structure and bonding in copper.
Explain why copper conducts electricity.
Copper can be bent and drawn into wires without breaking.
Explain why.
A student tests whether potassium iodide conducts electricity.
The table shows the results.
| State of potassium iodide | Conducts electricity? |
|---|---|
| solid | no |
| molten | yes |
| dissolved in water | yes |
Explain these results.
Explain why potassium iodide has a high melting point.
60 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.