Table 5.1 gives information about aluminium and copper:
Table 5.1
Aluminium | Copper | |
Density in g/cm³ | 2.7 | 8.9 |
Melting point / (°C) | 660 | 1084 |
Electrical conductivity | high | high |
Other information | Forms a layer of aluminium oxide which preventscorrosion | Some copper compounds are toxic |
Use information from Table 5.1 to answer the following questions.
(i) State why aluminium and copper are used in electrical cables.
[1]
(ii) State why aluminium is used in overhead electrical cables.
[1]
(iii) State why copper is not used to make food containers.
[1]
Steel is an alloy of iron. There are different types of steel.
Fig. 5.1 shows the arrangement of particles in pure iron and in one type of steel.
Fig. 5.1
(i) Describe what is meant by an alloy.
[1]
(ii) Explain why steel is stronger than pure iron.
[2]
(iii) Stainless steel is an alloy of iron. Stainless steel is used to make cutlery because it is strong.
State one other reason why stainless steel is used to make cutlery.
[1]
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