The uses of metals are often related to their properties.

a. Describe the structure of a typical metal.

b. Explain why metals are malleable.

c. Use the information in the table below to answer the questions that follow.

i. Why is aluminium more suitable than steel for building aeroplane bodies?

ii. Explain why overhead electricity cables are made from aluminium with a steel core rather than just from copper.

d. The effect of alloying copper with zinc on the strength of the alloy is shown in the table below.

i. Describe and explain the change in tensile strength as the percentage of zinc increases from 0% to 40%.

ii. State the name of the alloy of copper with zinc.

e. Many metals, such aluminium, can be recycled. Give three reasons why about 90% of aluminium is made by recycling rather than extracting it from its ore.

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Element Density/g cm-3 Tensile strength/1010 Pa Electrical conductivity/10®sm1 aluminium 2.70 7.0 0.38 copper 8.92 13.0 0.59 steel 7.86 21.1 0.10