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Metals As Conductors (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Metals As Conductors' 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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What is meant by the phrase "delocalised electrons" in a metal?
Why are metals often good thermal conductors as well as electrical conductors?
Which explanation correctly describes why metals in a wire heat up when a large current flows?
What happens to the conductivity of a metal if you raise the temperature significantly (for a normal metal)?
Which of the following best describes why metals can form alloys while ionic compounds generally cannot form useful alloy-like mixtures?
Why do metals not conduct electricity in ionic solid state but do when molten?
What is the main reason copper wires are often tinned (coated with a thin layer of tin) for connections?
In a metal lattice model, what do the positive ions represent?
Which statement correctly compares conduction of heat and conduction of electricity in metals?
Why is gold sometimes used for electrical connectors in electronics despite being expensive?
Which statement best explains why pure copper is preferred over pure aluminium for many household electrical wires?