DP Chemistry (first assessment 2025)
Question 19M.2.HL.TZ1.d
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ1.d |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Classify | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 1]
19M.2.HL.TZ1.d
Classify polybutadiene as either an addition or condensation polymer, giving a reason.
[1]
Markscheme
addition AND not two different functional groups reacting
OR
addition AND formed by breaking one bond of the carbon–carbon double bonds
OR
addition AND empirical formula of monomer equals empirical formula of polymer
OR
addition AND no atoms removed/all atoms accounted for/no loss of water/ammonia/inorganic by-product/small molecules
OR
addition AND atom economy/efficiency is 100 %
OR
addition AND there is only one «reaction» product [✔]
Examiners report
Some candidates failed to score the mark as they did not give a reason for classifying polybutadiene as an addition polymer.
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.