This question is about poly(ethene) and polyesters - AQA - GCSE Chemistry - Question 4 - 2021 - Paper 2
Question 4
This question is about poly(ethene) and polyesters.
Poly(ethene) is produced from ethene.
Figure 3 shows part of the displayed structural formula equation for the ... show full transcript
Worked Solution & Example Answer:This question is about poly(ethene) and polyesters - AQA - GCSE Chemistry - Question 4 - 2021 - Paper 2
Step 1
Complete Figure 3
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Answer
The structural formula equation for the reaction should show the polymerization process where ethene (C₂H₄) molecules react to form poly(ethene), represented as:
extnC2extH4ightarrow−ext(C2extH4ext)n−
Step 2
Suggest why poly(ethene) is easier to recycle than thermosetting polymers
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Answer
Poly(ethene) melts when heated, allowing it to be reshaped into new products. In contrast, thermosetting polymers harden and cannot be reshaped once set.
Step 3
How can different forms of poly(ethene) be produced from ethene?
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Different forms of poly(ethene) can be produced by using different reaction conditions, such as varying temperatures or pressures during polymerization.
Step 4
Explain why HDPE has a higher density than LDPE
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HDPE has more closely packed polymer chains or molecules due to its unbranched structure, resulting in a higher number of atoms per unit volume compared to LDPE, which has branched structures.
Step 5
Draw a circle on Figure 5 around an alcohol functional group
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Answer
Circle the -OH group in monomer B.
Step 6
Complete Table 2
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Answer
For monomer A reacting with monomer B, the formula of the small molecule produced is H₂O.
For monomer A reacting with monomer C, the formula of the small molecule produced is HCl.
