The addition polymer poly(butene) has the displayed structural formula:
CH₃ CH₃
│ │
C C
│ │
H H
Poly(butene) is produced from the monomer butene - AQA - GCSE Chemistry - Question 2 - 2022 - Paper 1
Question 2
The addition polymer poly(butene) has the displayed structural formula:
CH₃ CH₃
│ │
C C
│ │
H H
Poly(butene) is produced from the monomer butene.
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Worked Solution & Example Answer:The addition polymer poly(butene) has the displayed structural formula:
CH₃ CH₃
│ │
C C
│ │
H H
Poly(butene) is produced from the monomer butene - 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 is:
CH₃ H
│ │
C = C
│ │
H CH₃
This structure reflects the double bond between the two carbon atoms, characteristic of alkenes.
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 because it is a non-conductive material that can contaminate the copper during the recycling process. This contamination can affect the purity and conductivity of the recycled copper, making it less valuable.
Step 3
Describe how scrap copper wire can be recycled to make new copper water pipes.
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Answer
To recycle scrap copper wire, first, it needs to be collected and sorted. The wires are then cleaned to remove insulation. After that, the clean copper is melted in a furnace. Once molten, it is poured into molds to form new sheets or pipes. Finally, these new copper products can be shaped and processed for use in plumbing and other applications.
Step 4
Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores.
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Recycling uses significantly less energy compared to the mining and processing of copper from ores, which involves extensive excavation and consumption of fossil fuels.
It reduces environmental degradation and habitat destruction resulting from mining activities as it minimizes the need for new mining operations.
Step 5
Name the solution added.
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Answer
The solution added is sodium hydroxide (NaOH) or ammonia (NH₃).
Step 6
Give the result of the test.
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Answer
When added to copper sulfate solution, these solutions produce a blue precipitate, 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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To test for sulfate ions, add 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.
