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Sizes Of Particles And Their Properties (chemistry Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Sizes Of Particles And Their Properties (chemistry Only)' 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 ionic compounds conduct electricity when molten but not as solids?
How does the structure of graphite explain its lubricating properties?
Which property would you expect from a material with a giant ionic lattice?
Which structure describes a giant lattice of positive ions surrounded by a ‘sea’ of delocalised electrons, explaining conductivity and malleability?
Why do metals conduct heat and electricity?
Why are alloys often used for objects requiring greater hardness than pure metals?
Which of the following is true for giant covalent structures like silicon dioxide?
Which substance is most likely to conduct electricity when molten but not when solid?
Which factor mainly determines whether a substance is soluble in water?
Which of the following is a property of ionic compounds?
Why do metals tend to have high melting points?