DP Chemistry (first assessment 2025)

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Question 20N.1A.SL.TZ0.10

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.10
Level	SL	Paper	1A	Time zone	TZ0
Command term	Predict	Question number	10	Adapted from	N/A

10.

[Maximum mark: 1]

20N.1A.SL.TZ0.10

Which molecule is most polar?

A. ${CHF}_{3}$

B. ${CF}_{4}$

C. ${CClF}_{3}$

D. ${CCl}_{4}$

[1]

Markscheme

A

Examiners report

63% of the candidates could identify CHF₃ as more polar than CClF₃. A surprising number selected either CCl₄ or CF₄ as the most polar.

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.6—Molecular polarity depends on both bond polarity and molecular geometry. Deduce the net dipole moment of a molecule or ion by considering bond polarity and molecular geometry.