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 displayed structural formula of styrene can be completed by placing the C=C bond in the correct position:
C6H5HC=CHH
Step 2
Name the functional group in monomer B.
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Answer
The functional group in monomer B is a carboxylic acid group (–COOH).
Step 3
Name the small molecule.
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Answer
The small molecule produced when monomers A and B combine 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 it does not have strong cross-links that hold the polymer chains in a fixed position. Therefore, upon heating, the chains can move more freely, leading to melting.
Step 5
Draw one line from each material to the description of that material.
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Answer
Hydrocarbon — Matrix
Glass fibres — Reinforcement
Monomer — Polypeptide
Polyester — Matrix
Step 6
Suggest two reasons why an outer skin is added to the poly(styrene) core.
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Answer
The outer skin makes the surfboard stronger and more rigid.
It enhances the durability and toughness of the surfboard.
