DP Chemistry (first assessment 2025)

Question 20N.1A.SL.TZ0.11

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.11
Level	SL	Paper	1A	Time zone	TZ0
Command term	Interpret	Question number	11	Adapted from	N/A

11.

[Maximum mark: 1]

20N.1A.SL.TZ0.11

Which combination correctly describes the geometry of the carbonate ion, ${CO}_{3}^{2 -}$ ?

[1]

Markscheme

Examiners report

Identifying correct electron domain and molecular geometries around a central atom was somewhat challenging and answered slighter better by higher scoring candidates.

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.4—The valence shell electron pair repulsion (VSEPR) model enables the shapes of molecules to be predicted from the repulsion of electron domains around a central atom. Predict the electron domain geometry and the molecular geometry for species with up to four electron domains.

Question 20N.1A.SL.TZ0.11

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