DP Chemistry (last assessment 2024)
Question 22N.2.hl.TZ0.1d.viii
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.2.hl.TZ0.1d.viii |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Deduce, Justify | Question number | d.viii | Adapted from | N/A |
d.viii.
[Maximum mark: 1]
22N.2.hl.TZ0.1d.viii
Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.
Cold packs contain ammonium nitrate and water separated by a membrane.
(d.viii)
Deduce, with a reason, the position of the equilibrium.
[1]
Markscheme
product/right/solution/NH4NO3 (aq) is favoured AND K>1 ✔
Accept K large.
Accept other valid ways of justifying equilibrium position such as ΔG<0/spontaneous/ΔH<0 AND ΔS>0.
Examiners report
About 70% of candidates correctly assessed the equilibrium position corresponding to constant calculated, however quite a few candidates seemed to think that K>0, not K>1, was the criterion.
