Metals are extracted from substances naturally occurring in the Earth’s crust - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Question 4
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 cal... show full transcript
Worked Solution & Example Answer:Metals are extracted from substances naturally occurring in the Earth’s crust - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2019 - Paper 1
Step 1
Which of these metals is usually found uncombined in the Earth’s crust?
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Answer
The only correct answer is B. Gold is typically found uncombined in nature, while calcium, iron, and magnesium are usually found combined with other elements.
Step 2
Write the word equation for this reaction.
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Answer
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 is known as reduction.
Step 4
Give the number of ions in the formula Al₂O₃.
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Answer
Aluminium oxide, Al₂O₃, consists of 5 ions: 2 aluminium 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
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
C (obtaining and processing the raw materials) → D (using the product) → A (disposal of the product) → B (manufacturing the product)
Step 7
Give two advantages of obtaining aluminium by recycling aluminium waste rather than mining the raw material.
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Answer
Recycling aluminium saves energy as it requires less energy compared to extracting aluminium from ore.
It reduces environmental impact by minimizing mining activities and waste production.
