DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ1.d(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.SL.TZ1.d(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.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.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.1—How much? The amount of chemical change » Reactivity 2.1.2—The mole ratio of an equation can be used to determine: • the masses and/or volumes of reactants and products • the concentrations of reactants and products for reactions occurring in solution. Calculate reacting masses and/or volumes and concentrations of reactants and products.