DP Chemistry (last assessment 2024)
Question 22M.1.sl.TZ2.18
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1.sl.TZ2.18 |
| Level | sl | Paper | 1 | Time zone | TZ2 |
| Command term | Solve | Question number | 18 | Adapted from | N/A |
18.
[Maximum mark: 1]
22M.1.sl.TZ2.18
The equilibrium constant, Kc, for the reaction 2A + 4B 2C + 4D has a value of 4.0. What is the value of Kc for the reaction below at the same temperature?
C + 2D A + 2B
A. 0.25
B. 0.50
C. 1.0
D. 16
[1]
Markscheme
B
Examiners report
60% of the candidates deduced the value of Kc for related equations. The question had a strong discrimination between high-scoring and low-scoring candidates.