DP Chemistry (last assessment 2024)
Question 22M.2.sl.TZ1.1d(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.sl.TZ1.1d(i) |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Calculate | Question number | d(i) | Adapted from | N/A |
d(i).
[Maximum mark: 1]
22M.2.sl.TZ1.1d(i)
When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.
The presence of magnesium nitride can be demonstrated by adding water to the product. It is hydrolysed to form magnesium hydroxide and ammonia.
(d(i))
Calculate coefficients that balance the equation for the following reaction.
__ Mg3N2 (s) + __ H2O (l) → __ Mg(OH)2 (s) + __ NH3 (aq)
[1]
Markscheme
«1» Mg3N2 (s) + 6 H2O (l) → 3 Mg(OH)2 (s) + 2 NH3 (aq)
Examiners report
This was generally very well done with almost all candidates being able to determine the correct coefficients.
