DP Chemistry (first assessment 2025)
Question 21M.2.SL.TZ2.b
| Date | May 2021 | Marks available | [Maximum mark: 3] | Reference code | 21M.2.SL.TZ2.b |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | State and explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 3]
21M.2.SL.TZ2.b
State and explain how the equilibrium would be affected by increasing the volume of the reaction container at a constant temperature.
[3]
Markscheme
pressure decrease «due to larger volume» ✓
reaction shifts to side with more moles/molecules «of gas» ✓
reaction shifts left/towards reactants ✓
Award M3 only if M1 OR M2 awarded.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.4—Le Châtelier’s principle enables the prediction of the qualitative effects of changes in concentration, temperature and pressure to a system at equilibrium. Apply Le Ch.telier’s principle to predict and explain responses to changes of systems at equilibrium.