An engineer is considering different forms of carbon for use in several products.
Which statements about the forms of carbon are correct?
Statement 1: A diamond coating is suitable for a cutting tool because its rigid network resists being pushed out of shape.
Statement 2: Graphite powder acts as a lubricant because strong forces prevent its layers from moving over each other.
Statement 3: A graphite electrode conducts electricity because delocalised electrons can move along its layers.
Statement 4: Graphene is almost transparent because it consists of separate small carbon molecules.
1 and 2 only
2 and 4 only
1 and 3 only
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.