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, using... 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
Ceramic has no reaction with water, making it more suitable for washbasins as it prevents damage or degradation when 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 (C₃H₆). It can be represented as:
H H
| |
H–C=C–C–H
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H H
All covalent bonds should be explicitly drawn, including the double bond between the first two carbon atoms.
Step 3
Explain why poly(chloroethene) is a suitable material for this purpose.
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Answer
Poly(chloroethene) is used in electrical cables because it is a good insulator, which prevents electricity from conducting and protects against shock. Additionally, it is flexible and less likely to break, providing durability in various conditions.
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 for the polyester are typically a diol and a dicarboxylic acid. An example is:
Diol (ethylene glycol):
H H
| |
H–C–C–O–H
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H H
Dicarboxylic acid (terephthalic acid):
O O
|| ||
H–C–C–C–C–H
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H H
All covalent bonds should be clearly indicated.
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 is water (H₂O) during the condensation reaction that creates the ester link.
