DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.a(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ2.a(i) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | State | Question number | a(i) | Adapted from | N/A |
a(i).
[Maximum mark: 1]
22M.2.hl.TZ2.a(i)
The overall equation for the production of hydrogen cyanide, HCN, is shown below.
CH4 (g) + NH3 (g) +O2 (g) → HCN (g) + 3H2O (g)
State why NH3 is a Lewis base.
[1]
Markscheme
donates «lone/non-bonding» pair of electrons ✔
Examiners report
The main error was the omission of lone electron "pair", though there was also a worrying amount of very confused answers for a very basic chemistry concept where 40% provided very incorrect answers.
