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Properties Of Metals And Alloys (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Properties Of Metals And Alloys' 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 observation shows that a metal A is more reactive than metal B when each is added separately to solutions of metal B`s nitrate?
Which of the following changes would increase the electrical resistance of a metal wire?
Which product forms at the negative electrode (cathode) during electrolysis of molten sodium chloride?
A student compares the reactivity of three metals by adding them (separately) to dilute hydrochloric acid. Which measurement most directly compares their reactivity?
Which statement explains why alloys usually have lower electrical conductivity than the pure metal?
Why are most electrical wires in household plug sockets made of copper rather than silver, even though silver has slightly higher conductivity?
What is a main environmental drawback of using high temperatures in metal extraction (e.g. smelting)?
In extraction of aluminium by electrolysis of aluminium oxide (Al2O3) dissolved in cryolite, why is cryolite used?
Which of the following best describes why nanoparticles of a metal may behave differently from bulk metal?
How does adding a small amount of carbon to iron (to make steel) primarily change the metal?
Why are most metals good conductors of electricity in the solid state?