DP Chemistry (last assessment 2024)
Question 17N.2.sl.TZ0.5a
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.2.sl.TZ0.5a |
| Level | sl | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
17N.2.sl.TZ0.5a
Many reactions are in a state of equilibrium.
(a)
The following reaction was allowed to reach equilibrium at 761 K.
H2 (g) + I2 (g) 2HI (g) ΔHθ < 0
Outline the effect, if any, of each of the following changes on the position of equilibrium, giving a reason in each case.
[2]
Markscheme
Award [1 max] if both effects are correct.
Reason for increasing volume:
Accept “concentration of all reagents reduced by an equal amount so cancels out in Kc expression”.
Accept “affects both forward and backward rates equally”.