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2.5 Types of substance

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Question 15
H

Graphite is soft enough to be used as a lubricant, but it has a very high melting point.

Which explanation accounts for both of these properties?

[1]
A

Weak forces between layers let them slide; strong covalent bonds within layers must break to melt it

B

Weak covalent bonds between layers let them slide; strong forces within layers must break to melt it

C

Delocalised electrons let the layers slide; strong forces between layers must be overcome to melt it

D

Weak covalent bonds within layers break easily; strong forces between layers must break to melt it

Markscheme

2.5 Types of substance Questions

  1. GCSE
  2. /Chemistry
  3. /2.5 Types of substance

48 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.

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