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 reaction. Complete Figure 3. Poly(ethene) is a thermosoftening polymer. Suggest why poly(ethene) is easier to recycle than thermosetting polymers. Ethene produces different forms of poly(ethene). How can different forms of poly(ethene) be produced from ethene? Two different forms of poly(ethene) are: - high density poly(ethene) (HDPE) - low density poly(ethene) (LDPE). Figure 4 represents part of the structures of HDPE and LDPE. Explain why HDPE has a higher density than LDPE. Figure 5 shows three monomers, A, B and C. Monomer A can react with monomer B and with monomer C to produce polyesters. Draw a circle on Figure 5 around an alcohol functional group. Complete Table 2 to show the formula of the small molecule produced when: - monomer A reacts with monomer B - monomer A reacts with monomer C.

GCSE AQA Chemistry Synthetic & Natural Polymers: This question is about poly(ethe

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 complete reaction can be represented as follows:

ext{n C}_2 ext{H}_4 \rightarrow ext{(C}_2 ext{H}_4 ext{)}_n

This shows that ethene (C₂H₄) polymerizes to form poly(ethene) with the repeating unit (C₂H₄)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 do not melt and cannot be reshaped once set.

Step 3

How can different forms of poly(ethene) be produced from ethene?

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Answer

Different forms of poly(ethene) can be produced by using different reaction conditions, such as varying the temperature and pressure during polymerization.

Step 4

Explain why HDPE has a higher density than LDPE

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Answer

HDPE has unbranched polymer chains which allows the molecules to pack closely together, resulting in a higher density compared to LDPE, where the polymer chains are branched and less tightly packed.

Step 5

Draw a circle on Figure 5 around an alcohol functional group

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Answer

The alcohol functional group in Monomer B is indicated by circling the -OH group.

Step 6

Complete Table 2 to show the formula of the small molecule produced when: - monomer A reacts with monomer B - monomer A reacts with monomer C

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Answer

The small molecule produced when:

Monomer A reacts with Monomer B is H₂O (water).
Monomer A reacts with Monomer C is HCl (hydrochloric acid).

This question is about poly(ethene) and polyesters - AQA - GCSE Chemistry - Question 4 - 2021 - Paper 2

Worked Solution & Example Answer:This question is about poly(ethene) and polyesters - AQA - GCSE Chemistry - Question 4 - 2021 - Paper 2

Complete Figure 3

Suggest why poly(ethene) is easier to recycle than thermosetting polymers

How can different forms of poly(ethene) be produced from ethene?

Explain why HDPE has a higher density than LDPE

Draw a circle on Figure 5 around an alcohol functional group

Complete Table 2 to show the formula of the small molecule produced when: - monomer A reacts with monomer B - monomer A reacts with monomer C

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