GCSE Chemistry
› C10.2 Alloys, ceramics, polymers and composites
Alloys, ceramics, polymers and composites
Free GCSE Chemistry practice questions on Alloys, ceramics, polymers and composites.
Aligned with the UK Department for Education GCSE subject content — works for any UK GCSE exam board.
Sample questions below with detailed mark schemes. Sign up to practise the full set with spaced repetition.
Explain — 4 marks
A manufacturer is designing a new bicycle frame. They are considering three materials: steel (an alloy), carbon fibre composite, and aluminium alloy. The frame needs to be strong, lightweight, and durable for use in different weather conditions.
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(a) Explain why steel, which is an alloy of iron and carbon, is stronger than pure iron.
[1 mark]
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(b) Explain why a carbon fibre composite would be more suitable than pure polymer for a bicycle frame that needs to be both lightweight and strong.
[2 marks]
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(c) Explain why aluminium alloy is more resistant to corrosion than pure iron when exposed to wet weather conditions.
[1 mark]
Show mark scheme
- (a) The carbon atoms are different in size to iron atoms, so they distort the regular lattice structure / disrupt the arrangement of atoms
- (a) This prevents layers of atoms from sliding past each other as easily
- (a) Making the alloy stronger/harder than pure iron
- (b) Composite materials are made of two or more materials bonded together (1 mark)
- (b) Carbon fibres are strong and provide strength to the composite (1 mark)
- (b) The polymer matrix is lightweight, reducing the overall mass of the frame (1 mark)
- (b) Together they combine the advantages of both materials - strength and low density (1 mark)
- (c) Aluminium forms a thin, protective oxide layer on its surface
- (c) This oxide layer prevents water and oxygen from reaching the metal underneath
- (c) Iron does not form a protective oxide layer (or rust is porous and does not protect)
Compare — 3 marks
A manufacturing company needs to select a material for making kitchen worktops. They are considering three options: a ceramic tile surface, a polymer-based laminate, and a composite material made from wood fibres bonded with resin.
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(a) Compare the thermal properties of the ceramic tile and the polymer laminate for use as a kitchen worktop.
[2 marks]
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(b) Explain one advantage and one disadvantage of using a composite material instead of a pure ceramic for this application.
[1 mark]
Show mark scheme
- (a) Ceramic has a higher melting point / is more heat resistant than polymer
- (a) Polymer may soften or deform at high temperatures whereas ceramic will not
- (a) Ceramic conducts heat better / faster than polymer
- (a) Polymer is a better insulator than ceramic
- (b) Advantage: composite is more flexible/less brittle than pure ceramic, so less likely to crack if knocked
- (b) Advantage: composite combines strength of both materials
- (b) Disadvantage: composite is less heat resistant than ceramic at very high temperatures
- (b) Disadvantage: composite is more difficult/expensive to manufacture than single pure material
- (b) Disadvantage: the resin binder in composite may be less durable than ceramic over time
Explain — 4 marks
A manufacturer produces sports equipment using different materials. They need to decide between using carbon fibre reinforced polymer (CFRP) composite or aluminium alloy for a new bicycle frame. The CFRP composite consists of carbon fibres embedded in an epoxy resin matrix. The aluminium alloy is made by adding copper and magnesium to pure aluminium.
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(a) Explain why the aluminium alloy has different properties to pure aluminium.
[1 mark]
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(b) Explain why the carbon fibre reinforced polymer composite is stronger than the epoxy resin alone, despite both being polymers.
[2 marks]
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(c) The bicycle frame must be both strong and lightweight. Explain which material (CFRP composite or aluminium alloy) would be more suitable for this application, considering both the structure of the material and its properties.
[1 mark]
Show mark scheme
- (a) The copper and magnesium atoms distort the regular lattice structure of aluminium / disrupt the arrangement of atoms in the metallic structure, making it harder for layers to slide past each other / increasing strength
- (b) The carbon fibres are much stronger/stiffer than the epoxy resin matrix
- (b) The fibres carry most of the load/stress while the resin binds them together, so the composite has the combined properties of both materials / the strong fibres reinforce the weaker polymer
- (c) CFRP composite is more suitable because it has a high strength-to-weight ratio / it is stronger than aluminium alloy but lighter, due to the carbon fibres providing strength while the polymer matrix is very light
Calculate — 2 marks
A manufacturer produces brass door handles. Brass is an alloy containing copper and zinc. Each handle has a mass of 400 g and contains 35% zinc by mass.
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(a) Calculate the mass of zinc in one brass handle.
[1 mark]
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(b) The manufacturer has 70 kg of zinc available. Calculate the maximum number of brass handles that can be produced.
[1 mark]
Show mark scheme
- (a) 140 (g) / 0.35 × 400 = 140
- (b) 500 (handles) / 70 000 ÷ 140 = 500 / 70 ÷ 0.14 = 500
Evaluate — 3 marks
A kitchenware company is designing new cooking equipment. The design team are considering stainless steel (an alloy of iron, chromium and carbon), ceramic coatings, and silicone rubber (a polymer) for different components.
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(a) State one property of stainless steel that makes it different from pure iron.
[1 mark]
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(b) Evaluate the use of silicone rubber rather than stainless steel for the handles of saucepans.
[2 marks]
Show mark scheme
- (a) harder / stronger / more durable
- (a) more resistant to corrosion
- (a) melts at a lower temperature
- (b) silicone is a poor conductor of heat / good thermal insulator
- (b) so the handle stays cool to touch / prevents burns when the pan is hot
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