7.10 Addition polymerisation
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What happens to the C=C double bond during addition polymerisation?
Choose one answer.
Correct Not quite: the answer is It opens to become a single bond
Mark scheme
B
Model answer
B: the double bond opens up, so each carbon can join to the next monomer.
Name the polymer made from the monomer propene.
Mark scheme
- poly(propene) (1)
Model answer
Poly(propene).
Explain why addition polymerisation has only one product.
Mark scheme
- all the atoms of the monomers end up in the polymer / nothing is lost (1)
Model answer
The monomers simply join together, so all the atoms end up in the polymer.
The repeating unit of a polymer has two carbon atoms joined by a single bond. One carbon has two hydrogen atoms. The other has one hydrogen atom and one chlorine atom.
Name the monomer and describe its structure.
Mark scheme
- chloroethene (1)
- C=C double bond with three H atoms and one Cl atom (1)
Model answer
The monomer is chloroethene: two carbons joined by a double bond, with three hydrogen atoms and one chlorine atom.
Suggest why PTFE is used to coat non-stick frying pans.
Mark scheme
- slippery / food does not stick (1)
- unreactive / withstands high temperatures (1)
Model answer
PTFE is very slippery so food does not stick, and it is unreactive and resists high temperatures.
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