DP Chemistry (first assessment 2025)
Question 22M.2.SL.TZ1.3f(ii)
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.SL.TZ1.3f(ii) |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | f(ii) | Adapted from | N/A |
f(ii).
[Maximum mark: 2]
22M.2.SL.TZ1.3f(ii)
(f(ii))
Outline the requirements for a collision between reactants to yield products.
[2]
Markscheme
energy/E ≥ activation energy/Ea ✔
correct orientation «of reacting particles»
OR
correct geometry «of reacting particles» ✔
Examiners report
Generally well done with the vast majority of students correctly citing "correct orientation" and many only failed to gain the second mark through failing to equate the energy required to the activation energy.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.2—Species react as a result of collisions of sufficient energy and proper orientation. Explain the relationship between the kinetic energy of the particles and the temperature in kelvin, and the role of collision geometry.