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
To complete Figure 7, the displayed structural formula of styrene should show the double bond between the carbon atoms:
C₆H₅
|
C = C
|
H H
This structure confirms the correct bonding arrangement with the phenyl group.
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. This can also be referred to as the carboxyl group, which is represented as -COOH.
Step 3
Name the small molecule produced
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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 melts when heated because it is thermoplastic, meaning it softens upon heating due to weak intermolecular forces between the polymer chains.
Step 5
Draw one line from each material to the description of that material
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Answer
The following lines describe the relationship between each material and its description:
Hydrocarbon → Monomer
Glass fibres → Reinforcement
Matrix → Polyester
Polypeptide → Not applicable as no line is drawn.
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 more durable, protecting it from wear and tear.
It provides waterproofing, preventing water damage to the poly(styrene) core.
