A technician examines three samples. Each sample contains carbon only.
| Sample | Observations |
|---|---|
| P | A sheet one atom thick that conducts electricity |
| Q | A soft, slippery solid that conducts electricity |
| R | An extremely hard solid that does not conduct electricity |
Which statements about the samples are correct?
Statement 1: P is a fullerene because its carbon atoms form separate molecules.
Statement 2: Q is graphite because weak forces between its layers allow the layers to slide.
Statement 3: R is diamond because its carbon atoms form a rigid three-dimensional network.
Statement 4: P is graphene because delocalised electrons can move through the sheet.
1, 2 and 3 only
2 and 4 only
2, 3 and 4 only
1, 3 and 4 only
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.