DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ2.13

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ2.13
Level	SL	Paper	1A	Time zone	TZ2
Command term	Deduce	Question number	13	Adapted from	N/A

13.

[Maximum mark: 1]

21M.1A.SL.TZ2.13

What is the electron domain geometry of Si in SiO₂?

A. bent

B. linear

C. square planar

D. tetrahedral

[1]

Markscheme

D

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.