10.3 Using materials

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Question 40

An engineering company is choosing a material for a pump component that will be exposed to water.

The component must:

have a hardness of at least 90 HV
lose no more than 0.40 g during the corrosion test
be made from the least expensive material that meets both requirements.

Material	Composition by mass	Hardness in HV	Mass lost during corrosion test in g	Cost in £ per kg
P	88% copper, 12% tin	120	0.35	11.20
Q	70% copper, 30% zinc	100	0.30	8.40
R	100% copper	50	0.20	7.90

Name alloys P and Q.

[2]

Suggest which material should be used for the pump component.

Use data from the table to justify your answer.

[3]

Markscheme

10.3 Using materials Questions

GCSE
Chemistry
10.3 Using materials

118 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·10.3 Using materials