Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Extraction and Uses of Metals
128 practice questions
Topics covered
- Extracting metals from their ores19 practice questions
- Metals below carbon in the reactivity series19 practice questions
- Metals above carbon in the reactivity series18 practice questions
- Properties and uses of some metals19 practice questions
- Uses of aluminium19 practice questions
- Properties and uses of different kinds of steel20 practice questions
Practice questions
81–90 of 128
Question 81
1 mark · Easy
Answer and see the solution →Why does aluminium not corrode easily in air?
Question 82
3 marks · Easy
Answer and see the solution →Aluminium is widely used for outdoor electrical wiring and food packaging.
(a)[1 mark]Give one property of aluminium that makes it suitable for outdoor electrical wiring.
(b)[1 mark]Give one property that makes aluminium suitable for packaging food.
(c)[1 mark]Explain, with a reason, how the properties of aluminium relate to its use in these cases.
Question 83
2 marks · Easy
Answer and see the solution →A piece of pure aluminium can support a maximum load of 90 N before it bends permanently. An alloy of aluminium of the same size supports a load of 190 N before permanent bending. Calculate the difference in maximum loads supported, and state the reason for this difference.
Question 84
2 marks · Normal
Answer and see the solution →State why pure aluminium is rarely used for making structures. Briefly explain how adding other elements strengthens aluminium alloys.
Question 85
4 marks · Normal
Answer and see the solution →The diagram below shows a cross-section of a wire made from aluminium.
Cross-section of aluminium wire with oxide layer (a)[1 mark]What is the chemical name of the oxide layer that forms on aluminium?
(b)[1 mark]State how this oxide layer protects aluminium from corrosion.
(c)[2 marks]Explain one practical use of aluminium that relies on its resistance to corrosion.
Question 86
3 marks · Normal
Answer and see the solution →A company is designing lightweight power cables using aluminium. Each cable must have a mass of no more than 2.70 kg per metre. The density of pure aluminium is 2.70 g/cm³.
(a)[2 marks]Calculate the volume, in cm³, of aluminium in 1 metre of this cable.
(b)[1 mark]Explain why using aluminium, rather than copper (8 = 8.96 g/cm³), is suitable for lightweight cables.
Question 87
3 marks · Normal
Answer and see the solution →Explain, using ideas about atomic structure, why aluminium alloys are harder than pure aluminium. Include reference to the effect of atomic size differences.
Question 88
4 marks · Normal
Answer and see the solution →Effect of surface treatments on aluminium corrosion resistance Sample Surface treatment Observations after 1 month outside A None (bare aluminium) No visible change B Surface scratched White, powdery spots appear C Coated with oil No visible change Study the table above, which shows different treatments applied to aluminium samples left outside.
(a)[1 mark]Suggest why the untreated (bare) sample did not show corrosion after a month.
(b)[2 marks]Explain why scratching the surface resulted in white, powdery spots.
(c)[1 mark]What does the result for the oil-coated sample show about the use of oil as a protective measure?
Question 89
1 mark · Normal
Answer and check →Which property of aluminium makes it particularly suitable for use in overhead electricity cables?
- A.Low melting point
- B.High electrical conductivity
- C.Magnetic property
- D.Forms a coloured oxide
Question 90
2 marks · Normal
Answer and see the solution →Describe what happens to the movement of the layers of atoms in aluminium when it is alloyed. Explain why this affects the strength of the metal.