DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ2.7d

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.hl.TZ2.7d
Level hl Paper 2 Time zone TZ2
Command term Identify Question number d Adapted from N/A
d.
[Maximum mark: 2]
18M.2.hl.TZ2.7d

Some physical properties of molecular substances result from the different types of forces between their molecules.

(d)

Absorption of UV light in the ozone layer causes the dissociation of oxygen and ozone.

Identify, in terms of bonding, the molecule that requires a longer wavelength to dissociate.

[2]

Markscheme

O3 has bond between single and double bond AND O2 has double bond

OR

O3 has bond order of 1.5 AND O2 has bond order of 2

OR

bond in O3 is weaker/longer than in O2

 

O3 requires longer wavelength

 

M1: Do not accept “ozone has one single and one double bond”.

[2 marks]

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