DP Chemistry (first assessment 2025)
Question 20N.2.HL.TZ0.3c
| Date | November 2020 | Marks available | [Maximum mark: 3] | Reference code | 20N.2.HL.TZ0.3c |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Classify, Deduce | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
20N.2.HL.TZ0.3c
(c)
Classify PVC and polyethene terephthalate, PET, as addition or condensation polymers and deduce the structural formulas.
[3]
Markscheme
PVC: addition AND PET: condensation ✔
structure of PVC monomer ✔
structure of PET monomers ✔
Accept full OR condensed structural formulas.
Examiners report
This question on PVC and PET was very well answered. All three marks for their correct classification and the corresponding structures of their monomers was frequently scored.
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.4—From models to materials » Structure 2.4.6—Condensation polymers form by the reaction between functional groups in each monomer with the release of a small molecule. Represent the repeating unit of polyamides and polyesters from given monomer structures.