DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ1.d(ii)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.SL.TZ1.d(ii) |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Determine | Question number | d(ii) | Adapted from | N/A |
d(ii).
[Maximum mark: 1]
22M.2.SL.TZ1.d(ii)
Determine the oxidation state of nitrogen in Mg3N2 and in NH3.
[1]
Markscheme
Mg3N2: -3
AND
NH3: -3 ✔
Do not accept 3 or 3-
Examiners report
About 40% of students managed to correctly determine both the oxidation states, as -3, with errors being about equally divided between the two compounds.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.1—Oxidation and reduction can be described in terms of electron transfer, change in oxidation state, oxygen gain/loss or hydrogen loss/gain. Deduce oxidation states of an atom in a compound or an ion. Identify the oxidized and reduced species and the oxidizing and reducing agents in a chemical reaction.