Buckminsterfullerene, C60\mathrm{C_{60}}C60, and diamond are both forms of carbon.
C60\mathrm{C_{60}}C60 has a much lower melting point than diamond.
Which statement explains this?
The covalent bonds in C60\mathrm{C_{60}}C60 are much weaker than those in diamond.
Diamond is made of simple molecules, but C60\mathrm{C_{60}}C60 is a giant structure.
Melting C60\mathrm{C_{60}}C60 only overcomes weak forces between separate molecules.
C60\mathrm{C_{60}}C60 has fewer carbon atoms, so it has fewer covalent bonds to break.
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.