DP Chemistry (last assessment 2024)
Question 18N.3.hl.TZ0.c
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.hl.TZ0.c |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Compare and contrast | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18N.3.hl.TZ0.c
Solar energy, which is freely available, is indispensable to life on earth.
Contrast the importance of carbon dioxide and methane as greenhouse gases.
[2]
Markscheme
carbon dioxide/CO2 more/most abundant «GHG than methane/CH4»
OR
carbon dioxide/CO2 has «much» longer atmospheric life «than methane/CH4» ✔
methane/CH4 «much» better/more effective at absorbing IR radiation «than carbon dioxide/CO2»
OR
methane/CH4 has a greater greenhouse factor «than carbon dioxide/CO2»
OR
methane/CH4 has a greater global warming potential/GWP «than carbon dioxide/CO2» ✔
Accept “carbon dioxide/CO2 contributes more to global warming «than methane/CH4»”.
