DP Chemistry (last assessment 2024)

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

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

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

(a)

Draw the Lewis structures of oxygen, O2, and ozone, O3.

[2]

Markscheme

NOTES: Coordinate bond may be represented by an arrow.

Do not accept delocalized structure for ozone.

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