Explain how small molecules called monomers are used to make a polymer such as poly(ethene), and describe one use of poly(ethene) in everyday life.
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Model answer (4 marks)
Monomers are small molecules that join together to form a polymer.
The process is called addition polymerisation.
Ethene monomers contain a carbon–carbon double bond which opens during the reaction, allowing the monomers to link and form a long chain.
One everyday use of poly(ethene) is plastic bags.
The process is called addition polymerisation.
Ethene monomers contain a carbon–carbon double bond which opens during the reaction, allowing the monomers to link and form a long chain.
One everyday use of poly(ethene) is plastic bags.
Examiner tips
- Use the term "addition polymerisation" to show understanding of the process.
- Mention the double bond in ethene to justify how monomers join.
- Give a specific everyday example such as plastic bags.
Mark scheme (4 marks)
- Monomers are small molecules that join together (to form a polymer)
- The process is called addition polymerisation (or polymerisation)
- Ethene monomers contain a carbon-carbon double bond which opens/breaks to allow monomers to join, forming a long chain
- A correct everyday use of poly(ethene) stated, e.g. plastic bags, plastic bottles, packaging film, cling film
Key terms in this question
monomer · polymer · poly(ethene)
Related
- All Edexcel GCSE Chemistry (1CH0) revision notes →
- How to answer a "Explain" question →
- Decode the mark scheme abbreviations →
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