Figure 4 shows information about a ceramic and a metal - Edexcel - GCSE Chemistry - Question 5 - 2018 - Paper 1
Question 5
Figure 4 shows information about a ceramic and a metal.
The ceramic, rather than the metal, is a more suitable material for washbasins.
Give a reason for this, usin... show full transcript
Worked Solution & Example Answer:Figure 4 shows information about a ceramic and a metal - Edexcel - GCSE Chemistry - Question 5 - 2018 - Paper 1
Step 1
Give a reason for this, using a property from Figure 4.
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Answer
The ceramic has no reaction with water, making it a more suitable material for washbasins compared to metal. This property ensures durability and prevents corrosion, which is crucial for materials exposed to water.
Step 2
Draw the structure of the monomer molecule showing all covalent bonds.
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Answer
The monomer of poly(propene) is propene, with the structure:
H H
| |
H--C==C--H
| |
H H
Note: The double bond between the two carbon atoms indicates the unsaturation that allows for polymerization.
Step 3
Explain why poly(chloroethene) is a suitable material for this purpose.
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Answer
Poly(chloroethene) (PVC) is an excellent insulator, meaning it does not conduct electricity. This property ensures safety in electrical cables, as it prevents electric shocks and protects against short circuits. Additionally, PVC is flexible yet strong, making it easy to work with while also offering durability.
Step 4
What type of reaction takes place when polyesters are formed?
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Answer
B condensation
Step 5
Draw a molecule of each monomer showing all covalent bonds.
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Answer
The two monomers used to create the polyester typically include a carboxylic acid and an alcohol. For example, ethylene glycol and terephthalic acid can be represented as:
H O H O
| || / \
H--C--C--C -C--C--H
| | \ /
H H H H
(Note: This representation is simplified.)
Step 6
Give the name or formula of the small molecule formed when the monomer molecules react to form an ester link.
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Answer
The small molecule formed during the reaction is water (H2O). It is eliminated as a byproduct during the condensation reaction that forms the ester link.
