DP Chemistry (last assessment 2024)

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Question 20N.3.hl.TZ0.11e(i)

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.hl.TZ0.11e(i)
Level hl Paper 3 Time zone TZ0
Command term Compare and contrast Question number e(i) Adapted from N/A
e(i).
[Maximum mark: 1]
20N.3.hl.TZ0.11e(i)

Gasoline (petrol), biodiesel and ethanol are fuels.

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

(e(i))

When combusted, all three fuels can release carbon dioxide, a greenhouse gas, as well as particulates. Contrast how carbon dioxide and particulates interact with sunlight.

[1]

Markscheme

carbon dioxide allows sunlight/short wavelength radiation to pass through AND particulates reflect/scatter/absorb sunlight ✔

Accept “particulates reflect/scatter/absorb sunlight AND carbon dioxide does not”.
Accept “CO2 absorbs IR «radiation» AND particulates reflect/scatter/absorb sunlight”.

Do not accept “traps” for “absorbs”.

Examiners report

The wording of this question was critical which involved contrasting how carbon dioxide and particulates interact with sunlight. Some missed the "Contrast" command term as the action verb. Loose, non-scientific syntax was often seen such as stating "traps" instead of "absorbs".

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