Metals are extracted from substances naturally occurring in the Earth's crust - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Question 6
Metals are extracted from substances naturally occurring in the Earth's crust.
(a) Which of these metals is usually found uncombined in the Earth's crust?
A. calci... show full transcript
Worked Solution & Example Answer:Metals are extracted from substances naturally occurring in the Earth's crust - Edexcel - GCSE Chemistry - Question 6 - 2019 - Paper 1
Step 1
Which of these metals is usually found uncombined in the Earth's crust?
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Answer
The metal that is usually found uncombined in the Earth's crust is B. gold. Unlike other metals listed, gold is often found in its elemental form.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the extraction of zinc from zinc oxide by heating it with carbon is:
Zinc oxide + Carbon → Zinc + Carbon dioxide.
Step 3
State the type of reaction taking place when an oxide loses oxygen.
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Answer
The type of reaction taking place when an oxide loses oxygen is called a reduction reaction.
Step 4
Give the number of ions in the formula Al₂O₃.
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Answer
The formula Al₂O₃ consists of 5 ions: 2 aluminum ions (Al³⁺) and 3 oxide ions (O²⁻).
Step 5
Complete the balanced equation for the overall reaction by putting numbers in the spaces.
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Answer
The balanced equation for the overall reaction is:
2Al₂O₃ → 4Al + 3O₂.
Step 6
List the stages of the life-cycle assessment, using letters A, B, C, D, in the correct order from start to finish.
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Answer
The correct order of the stages of the life-cycle assessment is:
C, B, D, A.
Step 7
Give two advantages of obtaining aluminium by recycling aluminium waste rather than mining the raw material and extracting aluminium from that raw material.
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Answer
Recycling aluminium conserves natural reserves of raw materials, as it reduces the need to mine for new aluminium ore.
It requires less energy compared to processing aluminium waste, which lowers the overall environmental impact.
