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Polymer molecules can be made by joining together large numbers of small molecules called monomers - Edexcel - GCSE Chemistry - Question 3 - 2019 - Paper 1

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Polymer molecules can be made by joining together large numbers of small molecules called monomers. Figure 5 shows the names and structures of some polymers and the... show full transcript

Worked Solution & Example Answer:Polymer molecules can be made by joining together large numbers of small molecules called monomers - Edexcel - GCSE Chemistry - Question 3 - 2019 - Paper 1

Step 1

Complete the table using the information given.

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Answer

name of polymerstructure of polymer moleculename of monomerstructure of monomer molecule
poly(ethene)Ethene StructureetheneEthene Structure
poly(chloroethene)Chloroethene StructurechloroetheneChloroethene Structure
poly(tetrafluoroethene)Tetrafluoroethene StructuretetrafluoroetheneTetrafluoroethene Structure

Step 2

State two problems caused by the disposal of polymers.

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Answer

  1. Polymers can take hundreds of years to decompose, contributing to landfill issues.
  2. Some polymers release toxic substances when burned.

Step 3

Which of the following shows the structure of part of a poly(propene) molecule?

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Answer

The correct structure is likely option B, as it correctly reflects the repeating units of propene.

Step 4

Calculate the relative formula mass of the poly(propene) molecule made from joining together 24 600 molecules of propene, C₃H₆.

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Answer

The formula mass of propene (C₃H₆) is approximately 42 g/mol. For 24,600 molecules, the total relative mass of poly(propene) is:

24,600imes42=1,033,20024,600 imes 42 = 1,033,200

Therefore, the answer to three significant figures is 1,030,000 g/mol.

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