DP Chemistry (last assessment 2024)

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Question 19N.2.hl.TZ0.e(i)

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.hl.TZ0.e(i)
Level hl Paper 2 Time zone TZ0
Command term Identify Question number e(i) Adapted from N/A
e(i).
[Maximum mark: 1]
19N.2.hl.TZ0.e(i)

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

Identify the steps which absorb ultraviolet light.

[1]

Markscheme

steps 1 AND 3 ✔

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