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Covalent Bonding (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Covalent Bonding' 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 about covalent network solids is correct?
Which substance has a giant covalent structure?
Why do most simple molecular covalent substances have low melting points?
Why do giant covalent substances (e.g. silicon dioxide) have very high melting points?
Which explanation best describes why diamond is very hard?
Which of these substances is soluble in water because it forms hydrogen bonds with water?
Which best explains why simple covalent liquids have relatively low viscosities compared with polymers?
Which statement about covalent bonding in biological molecules is correct?
Which statement about electrical conductivity is correct for covalent compounds?
Which pair of elements is most likely to form a covalent bond?
Which pair shows hydrogen bonding is most likely to occur between molecules?