Figure 5 shows a surfer on a surfboard - AQA - GCSE Chemistry - Question 6 - 2019 - Paper 2
Question 6
Figure 5 shows a surfer on a surfboard.
Figure 6 shows the displayed structural formula of poly(styrene).
Figure 7 shows an incomplete displayed structural formula... show full transcript
Worked Solution & Example Answer:Figure 5 shows a surfer on a surfboard - AQA - GCSE Chemistry - Question 6 - 2019 - Paper 2
Step 1
Complete Figure 7.
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Answer
The complete structural formula for styrene is:
C₆H₅ H
| |
C = C
| |
H H
In this structure, the double bond between the two carbon atoms is correctly represented along with the corresponding hydrogen atoms.
Step 2
Name the functional group in monomer B.
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Answer
The functional group in monomer B is the carboxylic acid group, denoted by COOH.
Step 3
Name the small molecule.
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Answer
The small molecule produced when monomers A and B join together is water (H₂O).
Step 4
Why does this type of polyester melt when it is heated?
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Answer
This type of polyester is thermoplastic, meaning that it softens when heated. This occurs because the intermolecular forces are weak, and heating disrupts these forces, allowing the polymer chains to move more freely.
Step 5
Draw one line from each material to the description of that material.
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Answer
The connections are as follows:
Hydrocarbon → Monomer
Glass fibres → Reinforcement
Matrix → Polyester
Polypeptide → Not applicable (can remain unconnected as an extra option)
Step 6
Suggest two reasons why an outer skin is added to the poly(styrene) core.
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Answer
The outer skin improves durability, making the surfboard tougher and able to withstand impacts.
It enhances water resistance, preventing water ingress into the core material, thus prolonging the lifespan of the surfboard.
