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 calciu... 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 answer is B: gold. Gold is typically found in its native form, uncombined with other elements.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction of zinc oxide 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 that takes 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 number of ions in the formula Al2O3 is 5. It consists of 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 is:
4Al2O3 → 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 is:
C - obtaining and processing the raw materials
B - manufacturing the product
D - using the product
A - disposal of the product
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, reducing environmental impact.
It requires less energy compared to extracting aluminium from its ore, thus lowering pollution and resource usage.
