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2.3 Properties of materials

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Question 18

A geologist tests a mineral from a rock core. The mineral is hard, has a very high melting point and does not conduct electricity when solid.

Two bonding models are proposed:

  • an ionic lattice
  • a giant covalent structure

Which further observation would support the giant covalent model but not the ionic model?

[1]
A

The mineral dissolves in water to form a solution.

B

The mineral cracks apart when it is struck sharply.

C

The mineral does not conduct electricity when molten.

D

The mineral conducts electricity when molten.

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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