DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ1.6b(ii)
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.hl.TZ1.6b(ii) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 1]
21M.2.hl.TZ1.6b(ii)
When dinitrogen pentoxide, N2O5, is heated the colourless gas undergoes thermal decomposition to produce brown nitrogen dioxide:
N2O5 (g) → 2NO2 (g) + O2 (g)
Data for the decomposition at constant temperature is given.
(b(ii))
Outline why increasing the concentration of N2O5 increases the rate of reaction.
[1]
Markscheme
greater frequency of collisions «as concentration increases»
OR
more collisions per unit time «as concentration increases» ✔
Accept “rate/chance/probability/likelihood” instead of “frequency”.
Do not accept just “more collisions”.
