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SCH4U1 Investigation: VSEPR Theory
Chemists use molecular models to study the shapes of molecules. Since the models are built to reflect the
theory, they can be used to test your understanding of the theory. The purpose of this activity is to use VSEPR
theory to predict the shapes of some common molecules.
a) Assemble molecular models for the listed molecules and complete the table. Indicate approximate bond
angles on your 3-D diagrams. (1 mark per box = 33 marks)
Molecule
1. CF4
2. NCl3
3. OF2
4. CS2
5. CO32-
Lewis Structure
3-D diagram of molecule/Bond
Angles
Shape Name
For the organic molecules, you will need to determine the geometry on each central atom. Different parts of
each molecule may have a different shape.
Molecule
Lewis Structure
3-D diagram of molecule
Shape Name
6. C2H2
7. C2H4
8. C2H6
9. NH2OH
10. HCHO
(methanal)
11. CH3OH
12. Draw and determine the shapes of the following molecules: (6 marks)
a) AsCl5
b) AsOCl3
13. Which VSEPR shape is your favourite and why? (1 mark)
c) AsCl3