DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.4b
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ2.4b |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | State | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
22M.2.hl.TZ2.4b
Hydrogen and iodine react to form hydrogen iodide.
H2 (g) + 2 (g) 2H (g)
(b)
State two conditions necessary for a successful collision between reactants.
[1]
Markscheme
E ≥ Ea AND appropriate «collision» geometry/correct orientation ✔
Examiners report
Generally well answered by all but very weak candidates. Some teachers thought this should be a 2-mark question but actually the marks were generally missed when students mentioned both required conditions but failed to refer the necessary energy to Ea.
