Uses of aluminium
2 marks · HardDescribe two ways aluminium can be made stronger for practical applications.
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Also accept: Aluminium can be alloyed with other elements such as magnesium, copper or silicon.; Adding other metals or elements to aluminium makes it stronger.; Forming alloys distorts the atomic layers so they cannot slide so easily.
Common mistakes: Using pure aluminium.; Coating with plastic (not in content).
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Marking points
B1 · 1 mark · States that aluminium can be made stronger by alloying, i.e., mixing with other metals or elements (such as magnesium, silicon, or copper).
B2 · 1 mark · Describes how alloying makes aluminium stronger (e.g., distorts the regular lattice, prevents layers from sliding, or refers to atomic size differences).
Worked solution
Aluminium is made stronger by alloying, which means mixing it with elements such as magnesium, copper, or silicon.
Alloying introduces atoms of different sizes, distorting the regular arrangement and making it harder for layers to slide over each other.