Which of the following metals is found uncombined in the Earth’s crust?
A aluminium
B gold
C sodium
D zinc
When iron oxide is heated with carbon, iron is produced - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Question 4
Which of the following metals is found uncombined in the Earth’s crust?
A aluminium
B gold
C sodium
D zinc
When iron oxide is heated with carbon, iron... show full transcript
Worked Solution & Example Answer:Which of the following metals is found uncombined in the Earth’s crust?
A aluminium
B gold
C sodium
D zinc
When iron oxide is heated with carbon, iron is produced - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Step 1
Which of the following metals is found uncombined in the Earth’s crust?
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Answer
The metal that is found uncombined in the Earth's crust is gold (B). This is because gold is one of the least reactive metals and often exists in its native form.
Step 2
Complete the word equation for the reaction.
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Answer
The completed word equation is: iron oxide + carbon → iron + carbon dioxide.
Step 3
What happens to the iron oxide during this reaction?
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Answer
During this reaction, the iron oxide is D the iron oxide is reduced. This happens because carbon removes the oxygen from the iron oxide, producing iron.
