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2.3 Structure and bonding of carbon

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Question 3

An engineer is choosing a carbon coating for a sensor that becomes hot during use. The coating must remain solid at a high temperature.

MaterialStructureResult of heating test
PSeparate hollow cage molecules made from carbon atomsMelts at a relatively low temperature
QOne continuous sheet of carbon atoms joined by strong covalent bondsMelts only at a very high temperature

The engineer says, ‘Material P melts first because the covalent bonds inside its cages are weaker than the covalent bonds in material Q.’

Evaluate the engineer's explanation and justify which material should be used for the coating.

[3]
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2.3 Structure and bonding of carbon Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Structure and bonding of carbon

68 exam-style questions on AQA GCSE Chemistry 2.3 Structure and bonding of carbon, covering 2.3.1 Diamond, 2.3.2 Graphite, and 2.3.3 Graphene and fullerenes. Each one has a worked solution and a mark scheme showing where the marks go.

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