5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1
Question 5
5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer.
Aluminium is extracted from aluminium oxide by electrolysis.
The overall equ... show full transcript
Worked Solution & Example Answer:5 (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2016 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is B: aluminium oxide is reduced. This is because in the process of electrolysis, aluminium ions (Al3+) gain electrons to form aluminium metal, indicating a reduction reaction.
Step 2
Explain why.
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Answer
Lead can be extracted from its oxide by heating with carbon because lead is lower in the reactivity series compared to aluminium. This allows carbon to displace lead from its oxide, as carbon is capable of reducing lead oxide. In contrast, aluminium requires electrolysis for extraction due to its higher reactivity, which makes reduction with carbon inefficient or impossible.
