Question 11
FThe diagrams show the structures of four forms of carbon, P, Q, R and S.
Which statement is correct?
In both P and S, each carbon atom forms four covalent bonds.
Q is soft because the covalent bonds between its layers are weak.
S has a high melting point because it is a giant covalent structure.
Q and R both conduct electricity because each carbon atom forms three covalent bonds, so one outer electron from each atom is delocalised.
2.3 Properties of materials Questions
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.