DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ1.b(iii)
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.SL.TZ1.b(iii) |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Demonstrate | Question number | b(iii) | Adapted from | N/A |
b(iii).
[Maximum mark: 2]
22M.2.SL.TZ1.b(iii)
Demonstrate that your answer to (b)(i) is consistent with the effect of an increase in temperature on the percentage yield, as shown in the graph.
[2]
Markscheme
increased temperature decreases yield «as shown on graph» ✔
shifts equilibrium in endothermic/reverse direction ✔
Examiners report
Good performance; some did not relate that increased temperature decreases yield «as shown on graph» and others arrived at incorrect shift in equilibrium for the reaction.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.3—The magnitude of the equilibrium constant indicates the extent of a reaction at equilibrium and is temperature dependent. Determine the relationships between K values for reactions that are the reverse of each other at the same temperature.