Unreactive metals are found as uncombined metals in the Earth’s crust - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Question 3
Unreactive metals are found as uncombined metals in the Earth’s crust.
(a) Which of the following metals is found uncombined in the Earth’s crust?
A aluminium
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Worked Solution & Example Answer:Unreactive metals are found as uncombined metals in the Earth’s crust - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Step 1
Which of the following metals is found uncombined in the Earth’s crust?
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Answer
D zinc
Step 2
Complete the word equation for the reaction.
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Answer
iron oxide + carbon → iron + carbon dioxide
Step 3
What happens to the iron oxide during this reaction?
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Answer
D the iron oxide is reduced
Step 4
Give a reason why the starting mass of copper carbonate is always the same as the mass of the products formed.
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Answer
This is due to the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. Therefore, the total mass of the reactants (copper carbonate) is equal to the total mass of the products (copper oxide and carbon dioxide) when the reaction is completed.
