Addition polymerisation
2 marks · EasyPoly(propene) is made by the addition polymerisation of propene monomers.
State the number of carbon atoms present in the repeat unit of poly(propene).
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3 (±0)
Also accept: Three
Common mistakes: 2; 4
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Marking points
M1 · 1 mark · Recognises that the repeat unit comes from the monomer with all double bonds converted to single bonds and side groups retained.
A1 · 1 mark · Gives the correct number of carbon atoms in the repeat unit of poly(propene): 3.
Worked solution
The structure of propene is .
In addition polymerisation, the double bond opens and links to other monomers, but the number of carbon atoms in the monomer is the same as in the repeat unit.
Propene has 3 carbon atoms, so the repeat unit of poly(propene) contains 3 carbon atoms.