DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ2.c

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.SL.TZ2.c
Level	SL	Paper	2	Time zone	TZ2
Command term	Deduce	Question number	c	Adapted from	N/A

c.

[Maximum mark: 2]

21M.2.SL.TZ2.c

Deduce the Lewis (electron dot) structure and molecular geometry of sulfur dichloride, SCl₂.

[2]

Markscheme

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.1—A covalent bond is formed by the electrostatic attraction between a shared pair of electrons and the positively charged nuclei. The octet rule refers to the tendency of atoms to gain a valence shell with a total of 8 electrons. Deduce the Lewis formula of molecules and ions for up to four electron pairs on each atom.

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.