AO1 giant covalent structures

What is the name given to the structure of diamond, graphite and silicon dioxide? (1)

Giant covalent

How many bonds does each carbon have in diamond? (1)

4

Explain why diamond has a high melting point. (4)

Giant structure, 4 bonds per carbon atom, many strong covalent bonds between the atoms require a lot of energy to break

Explain why most giant covalent substances do not conduct electricity (2)

There are no electrons/ions/charged particles that are free to move

Making full reference to structure and bonding in graphite, explain how it conducts electricity (4)

Each carbon has 3 bonds, 1 electron is delocalised, free to carry charge through the structure

Explain why graphite can act as a lubricant (2)

Weak forces between layers, which are free to slide over each other

What is graphene? (1)

One layer of graphite

What is a fullerene? (1)

Substance made of carbon atoms arranged in a cage