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 calci... 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. Gold is found in its native state, while calcium, iron, and magnesium are typically found combined with other elements.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction 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 reduction.
Step 4
Give the number of ions in the formula Al2O3.
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Answer
The formula Al2O3 consists of 5 ions: 2 Al³⁺ ions and 3 O²⁻ ions.
Step 5
Complete the balanced equation for the overall reaction by putting numbers in the spaces.
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Answer
The completed balanced equation 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 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.
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Answer
Recycling aluminium reduces the need for mining, which can be environmentally damaging, preserving natural habitats.
Recycling uses significantly less energy compared to extracting and processing aluminium from the raw ore, leading to lower greenhouse gas emissions.
