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 as follows:
C6H5 H
|
C = C
|
H H
The double bond (C=C) is crucial for the formation of the polymer.
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.
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
Polyester is thermoplastic, meaning it becomes soft when heated. This occurs because the intermolecular forces are weak, allowing the polymer chains to separate and change their shape.
Step 5
Draw one line from each material to the description of that material.
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Answer
Material
Description of the material
Hydrocarbon
Monomer
Glass fibres
Reinforcement
Matrix
Polypeptide
Polyester
Thermoplastic
Step 6
Suggest two reasons why an outer skin is added to the poly(styrene) core.
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Answer
The outer skin is added to enhance the durability and toughness of the surfboard, making it harder and more rigid. Additionally, it provides waterproofing, which protects the poly(styrene) core from water damage.
