3 This question is about different forms of carbon
Figure 5 represents the structure of diamond
Figure 5
3-1 Describe the structure and bonding of diamond.
[3 marks]
ANSWER
It has a giant covalent structure with all the carbons joined by covalent bonds in a giant lattice. This can be thought of as a continuous network of atoms linked by covalent bonds. All the carbons joined by covalent bonds in a giant lattice. Each carbon atom is covalently bonded to four other carbon atoms
3-2 Explain why diamond has a very high melting point.
[3 marks]
ANSWER
Covalent bonds are strong and many covalent bonds must be broken so a lot of energy is required hence high melting point.
Figure 6 represents the molecule C70
Figure 6
3-3 What is the name of this type of molecule?
[1 mark]
ANSWER
Fullerene
3-4 Molecules such as C70 can be used in medicine to move drugs around the body.
Suggest one reason why the C70 molecule is suitable for this use.
[1 mark]
ANSWER
For delivery of drugs throughout or specific parts of the body and/or cells – the drugs are often carried inside the hollow center of the fullerene molecule.
3-5 Calculate the number of C70 molecules that can be made from one mole of carbon atoms.
The Avogadro constant = 6.02 × 1023 per mole
[3 marks]
ANSWER
