CAIE IGCSE Chemistry 9.3.2 Alloys can be harder & stronger than

Practise explaining why alloys are often more useful than pure metals by comparing hardness, strength and brittleness.

Exam points

select the statement that alloys can be harder and stronger than pure metals
relate excess carbon in iron to brittleness when judging whether the material is useful

[Maximum number: 2]

Gallium is a metallic element in Group III. It has similar properties to aluminium.

Alloys of gallium and other elements are often more useful than the metallic element itself. Suggest two reasons why alloys of gallium are more useful than the metallic element.

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9.3.2—Alloys can be harder and stronger than question 1