| 1 | 2 | 3 | 4 | 5 | 6 |
Question 1
Diamond and graphite both contain the same element. |
a) | What is the name of this element?
|
b) | Graphite is softer than diamond. Explain why.
|
c) | Graphite conducts electricity, but diamond does not. Explain why.
|
|
Question 2
Different forms of carbon have different uses in the modern world. The image below shows the structure of diamond and graphite. |
a) | Pencils are used for writing because graphite rubs off the pencil onto the paper. Explain why graphite is used in pencils. Include information on the bonding and structure in graphite.
|
b) | Abrasives are hard materials used to wear away the surface of softer materials. Explain why diamonds are used as abrasives. Include information on the structure and bonding in diamonds.
|
c) | A graphene sheet is a single layer of graphite. Graphene conducts electricity and can be used in loudspeakers and touchscreens. |
c) i) | Use the image above and your own knowledge to explain why graphene is strong.
|
c) ii) | Use the image above and your own knowledge to explain why graphene can conduct electricity.
|
d) | How many other atoms does each atom in graphene bond to? A one B two C three D four
|
e) | Suggest why a block of graphite, which has a large number of graphene sheets, could not be used for a touchscreen.
|
|
Question 3
Diamond and graphite are both made up of carbon atoms. The image below shows the structures of diamond and graphite. |
a) | Diamond and graphite have very different properties and uses in everyday life. The different properties of carbon and diamond arise from their different structures. |
a) i) | What property of diamond makes it suitable for use on the cutting end of a drill bit?
|
a) ii) | Explain why diamond has this property.
|
b) | Graphite is a good lubricant because it is slippery. Use the diagram to explain why graphite is slippery.
|
|
Question 4
Diamond is composed of carbon atoms. The arrangement of the carbon atoms in diamond determines its properties. |
a) | The diagram shows the outer electron shells of five carbon atoms in the giant lattice of diamond. Carbon atom C forms bonds with each of the carbon atoms 1, 2, 3 and 4. Draw the positions of all the electrons in the outer shells of each of carbon atoms C, 1, 2, 3 and 4.
|
b) | Explain why diamond has a high melting point.
|
|
Question 5
Explain why graphite is:
Your answer should refer to details of graphite's structure.
|
|
Question 6
Graphite and fullerenes are forms of carbon. The image below shows a model of a Buckminsterfullerene molecule. |
a) | A lubricant is a substance that allows materials to move over each other easily. Suggest why Buckminsterfullerene is a good lubricant.
|
b) | Buckminsterfullerene can be used in medicine to move drugs around the body. Suggest two reasons why Buckminsterfullerene is suitable for this use.
|
c) | Give one other use of a fullerene such as Buckminsterfullerene.
|
|
| 1 | 2 | 3 | 4 | 5 | 6 |