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2.3 Properties of materials

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Question 20

An engineer makes an electrical track in a flexible sensor from material X. The sensor works only if the track conducts electricity.

Each carbon atom has four outer electrons. Material X is a single layer of carbon atoms in a hexagonal arrangement. Each carbon atom is covalently bonded to three other carbon atoms. Material X contains no ions.

a.

Explain how the track can conduct electricity even though material X contains no ions.

[2]
b.

The engineer considers replacing material X with a thin coating of diamond. In diamond, each carbon atom is covalently bonded to four other carbon atoms.

Predict whether the sensor will work with the diamond coating. Explain your answer.

[2]
Markscheme

2.3 Properties of materials Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Properties of materials

122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.

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