DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ2.5c.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.hl.TZ2.5c.i
Level hl Paper 3 Time zone TZ2
Command term Distinguish Question number c.i Adapted from N/A
c.i.
[Maximum mark: 2]
18M.3.hl.TZ2.5c.i

Propene can polymerize to form polypropene.

Propene monomer: M18/4/CHEMI/HP3/ENG/TZ2/05

(c.i)

Distinguish between the manufacture of polyester and polyethene.

[2]

Markscheme

Any one of these alternatives:

ALTERNATIVE 1

Polyester: produced by condensation/esterification polymerization

Polyethene: produced by addition polymerization

 

ALTERNATIVE 2

Polyester: reaction between monomers/molecules containing two functional groups per molecule

Polyethene: reaction between monomers/molecules containing a carbon–carbon double bond/C=C

 

ALTERNATIVE 3

polyester polymerization forms a by-product/H2O

polyethene has no by-products/100% atom economy

 

Accept the names of different catalysts used for each polymerization as an alternative answer.

[2 marks]

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