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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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Why are covalent bonds in a giant covalent lattice so strong?
Why does graphite remain a solid at high temperature rather than melting into a liquid easily?
What is the main reason giant covalent materials are generally very hard?
Which type of bonding holds atoms together in diamond and graphite?
Why are giant covalent substances usually insoluble in water?
Which statement best describes the bonding in silicon dioxide (silica) as a giant covalent structure?
Why is graphite used in electrodes for some high-temperature electrolysis despite being less conductive than metals?
Which statement best explains why silicon dioxide (quartz) is used in high-temperature furnace linings?
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?
Graphite’s layers are held together by which type of force?