| Date | May 2017 | Marks available | 1 | Reference code | 17M.3.hl.TZ1.9 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | State | Question number | 9 | Adapted from | N/A |
Question
Antimony oxide is widely used as a homogeneous catalyst for the reaction of benzene-1,4-dicarboxylic acid with ethane-1,2-diol in the production of polyethylene terephthalate (PETE).
Deduce the repeating unit of the polymer and the other product of the reaction.
State the class of polymer to which PETE belongs.
Markscheme
Repeating unit:
Other product: water/H2O
Continuation bonds necessary for the mark.
Accept alternative repeating unit with O at other end.
Do not penalize square brackets or n.
[2 marks]
condensation
Accept polyester or thermoplastic.
[1 mark]
Examiners report
Syllabus sections
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17N.3.hl.TZ0.7c:
Identify the type of intermolecular bonding that is responsible for Kevlar®’s strength.
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17M.3.hl.TZ2.3c.ii:
Suggest, giving one reason, whether this is an addition or condensation reaction.
- 18N.3.hl.TZ0.2d.ii: Deduce the repeating unit of the polymer of X.
- 18N.3.hl.TZ0.2d.i: State the names of the two terminal functional groups in X.
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17M.3.hl.TZ1.9a:
Deduce the repeating unit of the polymer and the other product of the reaction.
- 17N.3.hl.TZ0.7b: Describe how the monomers of addition polymers and of condensation polymers differ.
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18M.3.hl.TZ1.4c.i:
Draw the structure of the monomer from which nylon-6 is produced by a condensation reaction.
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19N.3.hl.TZ0.5a:
Draw the structure of the monomers of Kevlar® if the by-product of the condensation polymerization is hydrogen chloride.
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19M.3.hl.TZ1.4e:
State one factor considered when making green chemistry polymers.
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18M.3.hl.TZ2.5c.i:
Distinguish between the manufacture of polyester and polyethene.
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19M.3.hl.TZ1.4d:
Classify polybutadiene as either an addition or condensation polymer, giving a reason.
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18N.3.hl.TZ0.2d.iii:
Repeating units of several polymers are listed.
The infrared (IR) spectrum of one of these polymers is shown.
Deduce, giving a reason, the name of this polymer and its Resin Identification Code (RIC), using sections 26 and 30 in the data booklet.
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16N.3.hl.TZ0.6d:
Fermentation of sugars from corn starch produces propane-1,3-diol, which can be polymerized with benzene-1,4-dicarboxylic acid to produce the PTT polymer (polytrimethylene terephthalate).
(i) Draw the molecular structure of each monomer.
(ii) Deduce the name of the linkage formed on polymerization between the two monomers and the name of the inorganic product.
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19M.3.hl.TZ2.5e:
Outline, giving a reason, how addition and condensation polymerization compare with regard to green chemistry.
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19M.3.hl.TZ2.5f:
Draw the full structural formula of the organic functional group formed during the polymerization of the two reactants below.
- 20N.3.hl.TZ0.3c: Classify PVC and polyethene terephthalate, PET, as addition or condensation polymers and...
