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 structural formula of butene can be represented as:
CH3 CH3
| |
C = C
| |
H H
This shows the two carbon atoms double-bonded (C=C) with the appropriate hydrogen atoms attached.
Step 2
Suggest why poly(butene) insulation must be removed from scrap copper wire before the copper is recycled.
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Poly(butene) insulation must be removed because it is a non-conductive polymer that can contaminate the copper during the recycling process, reducing the quality of the recycled metal.
Step 3
Describe how scrap copper wire can be recycled to make new copper water pipes.
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To recycle scrap copper wire into new water pipes, the wire is first stripped of insulation and then melted down in a furnace. The molten copper is poured into molds to create pipe shapes. Once cooled, the solidified copper pipes can then be processed for further use.
Step 4
Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores.
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First, recycling scrap copper uses significantly less energy compared to mining and processing ore, resulting in a smaller carbon footprint. Second, it reduces the need for mining activities, which can cause environmental degradation and habitat destruction.
Step 5
Name the solution added.
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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 the formation of a blue precipitate, 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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To test for the presence of sulfate ions, barium chloride (BaCl2) can be added 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, confirming the presence of sulfate ions.
