Question 18M.3.hl.TZ1.4
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.hl.TZ1.4 |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Deduce, Draw, Justify | Question number | 4 | Adapted from | N/A |
Both HDPE (high density polyethene) and LDPE (low density polyethene) are produced by the polymerization of ethene.
An alternative method of polymerizing molecules is condensation polymerization. One of the earliest condensation polymers was nylon-6. A short section of the polymer chain of nylon-6 is shown below.
Draw the structure of the monomer from which nylon-6 is produced by a condensation reaction.
[2]
–NH2 AND –COOH
six C-atoms
Accept –COCl instead of –COOH.
[2 marks]
Deduce, giving a reason, whether the atom economy of a condensation polymerization, such as this, would be greater or less than an addition polymerization, such as the formation of HDPE.
[1]
less AND a second molecule/product formed
Accept “not all the reactant molecules «in the equation» are converted «to product molecules»”.
[1 mark]
