DP Chemistry (last assessment 2024)

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Question 20N.3.sl.TZ0.9f(ii)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.sl.TZ0.9f(ii)
Level sl Paper 3 Time zone TZ0
Command term Compare and contrast Question number f(ii) Adapted from N/A
f(ii).
[Maximum mark: 2]
20N.3.sl.TZ0.9f(ii)

Gasoline (petrol), biodiesel and ethanol are fuels.

[U.S. Department of Energy. https://afdc.energy.gov/] 

(f(ii))

Methane is another greenhouse gas. Contrast the reasons why methane and carbon dioxide are considered significant greenhouse gases.

[2]

Markscheme

carbon dioxide is highly/more abundant «in the atmosphere» ✔

methane is more effective/potent «as a greenhouse gas»
OR
methane/better/more effective at absorbing IR «radiation»
OR
methane has greater greenhouse factor
OR
methane has greater global warming potential/GWP✔


Accept “carbon dioxide contributes more to global warming” for M1.

Examiners report

We received many good answers, but it was worrying the number of students that still provided general and shallow comments. Of the 3 contrast question this had the best response.

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