| Date | May 2016 | Marks available | 2 | Reference code | 16M.3.sl.TZ0.1 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Justify and State | Question number | 1 | Adapted from | N/A |
Question
The absorption of infrared (IR) radiation by molecules in the atmosphere affects global temperatures.
Using the graph, state, giving your reasons, whether or not oxygen and ozone are greenhouse gases.
Markscheme
Ozone: yes because it absorbs IR/is IR active
Oxygen: no because it does not absorb IR/is IR inactive
Award [1 max] for stating “ozone/O3 is a greenhouse gas but oxygen/O2 is not”.
Award [1 max] for stating “ozone/O3 absorbs IR/is IR active but oxygen/O2 does not/is IR inactive”.
Accept “oxygen/O2 is not a greenhouse gas because it absorbs UV”.
Examiners report
[N/A]
