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Alloys As Useful Materials (chemistry Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Alloys As Useful Materials (chemistry Only)' from the broader topic Using Resources. The test is geared towards the AQA exam board style syllabus.
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A metal alloy contains 88.2% copper and 11.8% tin by mass. What is the percent by mass of tin in 250 g of this alloy?
Which of these statements about bronze and brass is correct?
An alloy contains 92.5% iron and 7.5% carbon by mass. What mass of carbon is in 2.0 kg of this alloy?
Why are alloys generally used in place of pure metals for tools such as hammers and chisels?
Which of the following is a common use of bronze historically and today because of its alloy properties?
Why is recycling aluminium from used alloy products much more energy-efficient than producing aluminium from its ore (bauxite)?
Which alloy property is most important for making springs?
Why does adding zinc to copper to make brass change the colour compared with pure copper?
Which of the following is a key environmental benefit of recycling metal alloys rather than extracting new metal from ore?
Stainless steel is more resistant to corrosion than ordinary steel because it contains chromium. What is the role of the chromium?
Why are many precision machine parts made from alloys containing small amounts of other elements rather than from pure metals?