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OCR GCSE Combined Science

Topic questions Using resources Alternative methods of extracting metals

Alternative methods of extracting metals

5 questions · 16 marks · about 20 minutes

Alternative methods of extracting metals questions

TopicAlternative methods of extracting metals

OCR J250 Alternative methods of extracting metals 5 questions

Chemistry Paper 10 June 2024 Higher tier, Question 8 1 mark

Which method of extracting metals involves growing plants in soil that contains metal compounds?

A Bioleaching

B Decomposition

C Phytoextraction

D Reduction

Question 8, shown as an image
[1]
Reveal mark scheme Mark scheme for question 8

Chemistry Paper 10 June 2023 Higher tier, Question 13 7 marks

Copper can be extracted from its compounds by different processes.

(a)

Process 1

• Copper is extracted from copper oxide, CuO.

• The copper is extracted by heating copper oxide with carbon.

This is the equation for the reaction in Process 1.

2CuO(s) + C(s) → 2Cu(s) + CO2(g)

(a)(i)

Explain why carbon can be used to extract copper from copper oxide.

[1]
Reveal mark scheme Mark scheme for question 13(a)(i)
(a)(ii)

One of the products of this reaction causes an environmental problem.

Identify the product and describe its impact on the environment.

[1]
Reveal mark scheme Mark scheme for question 13(a)(ii)
(b)

Process 2

• Copper is extracted from copper sulfide, CuS.

• Solid copper sulfide is broken down by bacteria to form a solution of copper sulfate, CuSO4.

• The copper is extracted from the solution of copper sulfate by either reacting it with iron or by electrolysis.

(b)(i)

Why is process 2 described as a biological method of metal extraction?

[1]
Reveal mark scheme Mark scheme for question 13(b)(i)
(b)(ii)

Describe two advantages of extracting copper from the solution of copper sulfate by reacting it with iron rather than using electrolysis.

[2]
Reveal mark scheme Mark scheme for question 13(b)(ii)
(c)

Ores are rocks that contain metals or their compounds.

The table shows some information about high-grade and low-grade ores.

Grade of oreMass of ore (kg)Mass of metal in the ore (kg)
high501.5
low5008.0

Explain the difference in the mass of metal contained in a high-grade and low-grade ore.

Use information from the table.

[2]
Reveal mark scheme Mark scheme for question 13(c)

Chemistry Paper 10 November 2021 Higher tier, Question 15 6 marks

Phytoextraction is a method of producing metals such as copper using plants which are harvested and burnt to produce an ash.

(a)

The ash is reacted with sulfuric acid to produce a solution of copper(II) sulfate.

Copper can be extracted by adding iron to the solution of copper(II) sulfate.

Explain why.

[2]
Reveal mark scheme Mark scheme for question 15(a)
(b)

1 kg of plant ash can produce 2500 mg of copper.

Calculate the mass of ash (in kg) needed to produce 50 kg of copper.

1 kg = 1 × 106 mg

[2]
Reveal mark scheme Mark scheme for question 15(b)
(c)

Describe one advantage and one disadvantage of producing copper by phytoextraction.

[2]
Reveal mark scheme Mark scheme for question 15(c)

Chemistry Paper 10 June 2018 Higher tier, Question 10 1 mark

Which statement about extracting copper by phytoextraction is correct?

A Bacteria in the soil absorb the copper ions.

B Plant ash is equivalent to a high grade ore.

C Plant roots absorb copper metal from the soil.

D The plants are crushed to extract the copper ions.

Question 10, shown as an image
[1]
Reveal mark scheme Mark scheme for question 10

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