This is about copper wire and copper compounds - AQA - GCSE Chemistry - Question 1 - 2022 - Paper 2
Question 1
This is about copper wire and copper compounds.
Copper is used to make electrical wires.
Figure 1 shows how copper electrical wire is insulated using an addition p... show full transcript
Worked Solution & Example Answer:This is about copper wire and copper compounds - AQA - GCSE Chemistry - Question 1 - 2022 - Paper 2
Step 1
Complete Figure 2 to show the displayed structural formula of butene.
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Answer
The displayed structural formula of butene should illustrate the double bond between the two carbon atoms. It can be represented as:
H H
| |
H - C = C - H
| |
H H
Step 2
Suggest why poly(butene) insulation must be removed from scrap copper wire before the copper is recycled.
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Answer
Poly(butene) insulation must be removed to prevent contamination of the copper during the recycling process. If not removed, it could lead to impurities in the recycled copper, affecting its quality and conductivity.
Step 3
Describe how scrap copper wire can be recycled to make new copper water pipes.
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Scrap copper wire is first stripped of any non-metal parts, including insulation. The clean copper wire is then melted down in a furnace. After melting, it is poured into molds to form new shapes, such as pipes. The new copper pipes can then be used in plumbing and construction.
Step 4
Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores.
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Recycling scrap copper uses significantly less energy compared to mining and processing new copper ores, resulting in lower greenhouse gas emissions.
It helps to conserve natural resources by reducing the need for new copper mining, which can lead to habitat destruction and environmental degradation.
Step 5
Name the solution added.
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Answer
The solution commonly added to copper sulfate solution to test for copper(II) ions is sodium hydroxide (NaOH).
Step 6
Give the result of the test.
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The result of the test is the formation of a blue precipitate of copper(II) hydroxide, which indicates the presence of copper(II) ions.
Step 7
Describe one test to show the presence of sulfate ions in copper sulfate solution.
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A common test for sulfate ions involves adding barium chloride solution to the copper sulfate solution. If sulfate ions are present, a white precipitate of barium sulfate (BaSO4) will form.
Step 8
Give the result of the test.
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The result of the test will be the formation of a white precipitate, indicating the presence of sulfate ions in the solution.
