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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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Why do giant covalent substances (e.g. silicon dioxide) have very high melting points?
What is a coordinate (dative) covalent bond?
Why is graphite able to conduct electricity?
Which best explains why simple covalent liquids have relatively low viscosities compared with polymers?
Why are covalent compounds usually poor conductors of electricity when dissolved in water?
Why do most simple molecular covalent substances have low melting points?
Which of the following is a polar covalent molecule?
What happens to electron density when a polar covalent bond forms?
Which description fits a simple molecular covalent solid at room temperature?
Which statement about covalent network solids is correct?
Which pair shows hydrogen bonding is most likely to occur between molecules?