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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 statement best explains why silicon dioxide (quartz) is used in high-temperature furnace linings?
Which statement best describes the bonding in silicon dioxide (silica) as a giant covalent structure?
A piece of graphite is placed on a sheet of paper and rubbed; why does a grey mark appear?
Which description correctly contrasts molecular covalent substances with giant covalent substances?
Which allotrope of carbon provides the best lubrication because layers slide easily?
Why are covalent bonds in a giant covalent lattice so strong?
Which type of bonding holds atoms together in diamond and graphite?
Which allotrope of carbon is composed of spherical molecules (e.g., C60) rather than a giant covalent network?
Graphite’s layers are held together by which type of force?
Why can graphite be used to make electrodes in some batteries and electrolysis cells?
Which of the following correctly describes the shape around each carbon in diamond?