DP Chemistry (first assessment 2025)

Question 19N.2.SL.TZ0.b

Date	November 2019	Marks available	[Maximum mark: 2]	Reference code	19N.2.SL.TZ0.b
Level	SL	Paper	2	Time zone	TZ0
Command term	Outline, Predict	Question number	b	Adapted from	N/A

[Maximum mark: 2]

19N.2.SL.TZ0.b

Outline why both bonds in the ozone molecule are the same length and predict the bond length in the ozone molecule. Refer to section 10 of the data booklet.

Reason:

Length:

[2]

Markscheme

resonance «structures»
OR
delocalization of «the double/pi bond» electrons ✔
121 «pm» < length < 148 «pm» ✔

NOTE: Accept any length between these two values.

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.2—Single, double and triple bonds involve one, two and three shared pairs of electrons respectively. Explain the relationship between the number of bonds, bond length and bond strength.

Question 19N.2.SL.TZ0.b

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