Question 19M.3.hl.TZ1.4d
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ1.4d |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Classify | Question number | d | Adapted from | N/A |
Polybutadiene, used in truck tyres, is a polymer of buta-1,3-diene. The spatial arrangement of atoms in the polymer depends on the type of catalyst used.
Classify polybutadiene as either an addition or condensation polymer, giving a reason.
[1]
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 [✔]
Some candidates failed to score the mark as they did not give a reason for classifying polybutadiene as an addition polymer.
