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Giant Covalent Structures (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Giant Covalent Structures' from the broader topic Bonding, Structure, And The Properties Of Matter. The test is geared towards the AQA exam board style syllabus.
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Which of these is NOT a typical property of a giant covalent solid like diamond or silica?
Which statement best describes the bonding in silicon dioxide (silica) as a giant covalent structure?
Graphite’s layers are held together by which type of force?
Which is a correct consequence of the giant covalent structure of diamond for mechanical properties?
Why does increasing temperature not significantly increase the solubility of a giant covalent solid like diamond?
Why are giant covalent substances usually insoluble in water?
Which type of bonding holds atoms together in diamond and graphite?
Which structural feature of graphite makes it a good lubricant?
Which use relies on diamond’s property of being extremely hard?
A piece of graphite is placed on a sheet of paper and rubbed; why does a grey mark appear?
Graphene has a very high surface area. Which application directly benefits from this property?