DP Chemistry (last assessment 2024)

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Question 19N.2.sl.TZ0.1c

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.sl.TZ0.1c
Level sl Paper 2 Time zone TZ0
Command term Distinguish Question number c Adapted from N/A
c.
[Maximum mark: 1]
19N.2.sl.TZ0.1c

The equations show steps in the formation and decomposition of ozone in the stratosphere, some of which absorb ultraviolet light.


Step 1    O2 → 2O•

Step 2    O• + O2 → O3

Step 3    O3 → O• + O2

Step 4    O• + O3 → 2O2

(c)

Distinguish ultraviolet light from visible light in terms of wavelength and energy.

[1]

Markscheme

«UV» shorter wavelength AND higher energy «than visible» ✔

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