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 1 - 2022 - Paper 2
Question 1
The addition polymer poly(butene) has the displayed structural formula:
CH₃ CH₃
| |
C - C
| |
H H
Poly(butene) is produced from the monom... show full transcript
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 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 is:
CH₃ H
| |
C = C
| |
H CH₃
This shows the double bond between the two carbon atoms.
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. Insulating materials can interfere with the zinc coating, causing imperfections and affecting the quality of the recycled copper.
Step 3
Describe how scrap copper wire can be recycled to make new copper water pipes.
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Answer
Scrap copper wire is first sorted and stripped of any insulation. Then, it undergoes melting at high temperatures in a furnace. The molten copper is poured into molds to create ingots, which can then be processed into pipes through rolling or extrusion.
Step 4
Suggest two reasons why recycling scrap copper is more sustainable than extracting copper from copper ores.
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Answer
Recycling copper requires significantly less energy compared to mining and refining ore, leading to lower greenhouse gas emissions.
It reduces the need for land disruption and environmental degradation associated with mining activities.
Step 5
Name the solution added.
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Answer
The solution typically used to test for copper(II) ions is sodium hydroxide (NaOH).
Step 6
Give the result of the test.
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Answer
The result of the test is 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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Answer
One common test for sulfate ions involves adding barium chloride (BaCl₂) to the copper sulfate solution. If sulfate ions are present, a white precipitate of barium sulfate will form.
Step 8
Give the result of the test.
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Answer
The result of the test is the formation of a white precipitate, confirming the presence of sulfate ions.
