Question

11. A pink gold bracelet weighs 80 g. It is made from 76% gold, 18% copper and rest is aluminium. (a) What % is aluminium? (b) What is the mass of the gold in the bracelet? (c) What is the mass of the copper in the bracelet?
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Answer 1

Answer:

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Answer 2

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(a) Platinum, gold and silver are used to make jewellery because these are low reactive metals. So they rarely corrode and hence do not lose their shine and lustre.

(b) The reaction of these substances with oxygen is highly exothermic which may cause fire.

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