This is about copper wire and copper compounds - AQA - GCSE Chemistry - Question 2 - 2022 - Paper 1
Question 2
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 2 - 2022 - Paper 1
Step 1
Complete Figure 2 to show the displayed structural formula of butene.
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Answer
The displayed structural formula of butene can be represented as follows:
CH3 CH3
| |
C === C
| |
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 from scrap copper wire because the presence of insulation may contaminate the copper during the recycling process, making it less pure and unsuitable for further use.
Step 3
Describe how scrap copper wire can be recycled to make new copper water pipes.
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Scrap copper wire can be recycled by melting it down in a furnace. The molten copper is then filtered to remove impurities, and cast into molds to form new copper pipes. This recycling process conserves metal resources and reduces the energy required compared to extracting copper from ores.
Step 4
Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores.
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Energy Conservation: Recycling copper requires significantly less energy compared to mining and processing copper from ores, which involves extensive energy-intensive operations.
Resource Conservation: Recycling helps conserve natural resources and reduces the environmental impact associated with mining activities, such as habitat destruction and pollution.
Step 5
Name the solution added.
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Answer
The solution added is sodium hydroxide (NaOH).
Step 6
Give the result of the test.
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The result of the test is a blue precipitate of copper(II) hydroxide, indicating 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 (BaCl2) 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 is the formation of a white precipitate, indicating the presence of sulfate ions.
