DP Chemistry (last assessment 2024)
Question 19M.2.hl.TZ1.5c(iii)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.hl.TZ1.5c(iii) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce, Estimate | Question number | c(iii) | Adapted from | N/A |
c(iii).
[Maximum mark: 2]
19M.2.hl.TZ1.5c(iii)
Both vinegar (a dilute aqueous solution of ethanoic acid) and bleach are used as cleaning agents.
Bleach reacts with ammonia, also used as a cleaning agent, to produce the poisonous compound chloramine, NH2Cl.
(c(iii))
Deduce the molecular geometry of chloramine and estimate its H–N–H bond angle.
Molecular geometry:
H–N–H bond angle:
[2]
Markscheme
Molecular geometry:
«trigonal» pyramidal [✔]
H–N–H bond angle:
107° [✔]
Note: Accept angles in the range of 100–109.
Examiners report
Generally well done with some candidates misinterpreting the bond angle from the stated geometry.
