DP Chemistry (last assessment 2024)
Question 21M.2.hl.TZ1.c
Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.hl.TZ1.c |
Level | hl | Paper | 2 | Time zone | TZ1 |
Command term | Explain | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
21M.2.hl.TZ1.c
Oxygen exists as two allotropes, diatomic oxygen, O2, and ozone, O3.
Explain, using equations, how the presence of results in a chain reaction that decreases the concentration of ozone in the stratosphere.
[2]
Markscheme
✔
AND
✔
Do not penalize missing radical.
Accept:for M2:
AND
