Copper can be obtained from solutions of copper salts by electrolysis or by displacement using scrap iron.
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Card 17
Front
We should recycle metals because extracting them uses limited resources and is expensive in terms of energy and effects on the environment.
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Card 18
Front
Most iron is converted into steels. Steels are alloys since they are mixtures of iron with carbon.
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Card 19
Front
Most metals in everyday use are alloys. Pure copper, gold, iron and aluminium are too soft for many uses and so are mixed with small amounts of similar metals to make them harder for everyday use.
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Card 20
Front
Copper has properties that make it useful for electrical wiring and plumbing.
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Card 21
Front
Crude oil is a mixture of a very large number of compounds.
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Card 22
Front
Most of the compounds in crude oil consist of molecules made up of hydrogen and carbon atoms only (hydrocarbons). Most of these are saturated hydrocarbons called alkanes, which have the general formula CnH2n+2
