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 reaction of ethene to form poly(ethene) can be represented as:
ext(nethene)ightarrowextpoly(ethene)
The displayed structural formula equation should show the n repeating units of ethene linked by covalent bonds.
Step 2
Suggest why poly(ethene) is easier to recycle than thermosetting polymers
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Answer
Poly(ethene) melts upon heating, allowing it to be reshaped into new products, while thermosetting polymers do not melt and cannot be reshaped.
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 and pressures during polymerization.
Step 4
Explain why HDPE has a higher density than LDPE
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Answer
HDPE has unbranched polymer chains that are packed closely together, resulting in more atoms or molecules per unit volume, while LDPE has more branching, leading to a lower density.
Step 5
Draw a circle on Figure 5 around an alcohol functional group
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Answer
Circle the –OH functional group found in Monomer B.
Step 6
Complete Table 2 to show the formula of the small molecule produced when monomer A reacts with monomer B
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The small molecule produced when monomer A reacts with monomer B is water (H2O).
Step 7
Complete Table 2 to show the formula of the small molecule produced when monomer A reacts with monomer C
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Answer
The reaction of monomer A with monomer C produces hydrochloric acid (HCl).
