Figure 16 shows the structure of a molecule of dichloroethene - Edexcel - GCSE Chemistry - Question 10 - 2020 - Paper 1
Question 10
Figure 16 shows the structure of a molecule of dichloroethene.
C1H2
|
C=C
|
Cl Cl
Figure 16
(a) (i) Describe how dichloroethene monomers form a pol... show full transcript
Worked Solution & Example Answer:Figure 16 shows the structure of a molecule of dichloroethene - Edexcel - GCSE Chemistry - Question 10 - 2020 - Paper 1
Step 1
Describe how dichloroethene monomers form a polymer.
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Answer
Dichloroethene monomers form a polymer through a process called polymerization. In this process, the double bond in the dichloroethene monomer breaks, allowing the monomers to link together, forming a long chain. The reaction involves the addition of monomers, resulting in the formation of a poly(dichloroethene) polymer.
Step 2
Which of these represents the structure of the polymer formed from the monomer in Figure 16?
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Answer
B is the only correct answer.
Step 3
Separate samples of dichloroethene and poly(dichloroethene) are shaken with a few drops of bromine water. What would be seen?
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Answer
Only the dichloroethene and bromine water goes colourless.
Step 4
Complete the balanced equation for the overall reaction.
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Answer
C2H4 + 2Cl2 → C2H2Cl2 + HCl
Step 5
Explain one property that a plastic food wrapping must have.
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Answer
A plastic food wrapping must have good barrier properties to prevent moisture and air from entering. This helps in keeping the food fresh and preventing spoilage.
Step 6
Calculate the mass of dichloroethene that has NOT reacted.
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Answer
To find the mass of dichloroethene that has not reacted, we calculate 3.5% of 500 tonnes:
Mass not reacted = 500 tonnes * 0.035 = 17.5 tonnes.
To two significant figures, the answer is 18 tonnes.
