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CAIE A-Level Chemistry AS 3.5 Shapes of Molecules Questions

Practise using VSEPR to predict shapes, bond angles and angle changes in molecules and ions from electron-pair repulsion evidence.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • order labelled bond angles in diagrams using lone-pair and bonding-pair repulsions

Covered syllabus points

3.5.1—The shapes of, and bond angles in, molecules3.5.2—The shapes of, and bond angles in, molecules

Question 1

[Maximum number: 1]

Which shape is correctly predicted by VSEPR theory?

number of bonded electron pairs

number of lone pairs

shape

2

2

linear

2

2

tetrahedral

3

1

pyramidal

3

1

trigonal planar

Question 2

[Maximum number: 1]

The structure of the sulfur dioxide molecule is shown.

Figure for Question 2 — CAIE A-Level Chemistry AS

What is the shape of the sulfur dioxide molecule?

A

linear

B

non-linear

C

pyramidal

D

tetrahedral

Question 3

[Maximum number: 1]

In which structure are three atoms bonded together in a straight line?

A

poly(ethene), +CH2CH2Ψn+\mathrm{CH}_{2} \mathrm{CH}_{2} \Psi_{n}

B

propane, C3H8\mathrm{C}_{3} \mathrm{H}_{8}

C

silicon tetrachloride, SiCl4\mathrm{SiCl}_{4}

D

sulfur hexafluoride, SF6\mathrm{SF}_{6}

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