3.
3.1 CO2(g), SO, and CO(g) are some of the air pollutants in the South African
atmosphere.
3.1.1 CO has a dative covalent bond. Draw the Lewis structure for a carbon
monoxide molecule and use it to help explain the idea of a dative
covalent bond.
(3)
3.1.2 Explain why you would expect the CO molecule to be polar.
3.1.3 What is the nature of the partial charges on (i.e. the polarity of) the C
and O atoms in the CO molecule? Explain your answer.
(2)
(2)
3.2 Consider the gases CO, and SO₂
3.2.1 Refer to Lewis Diagrams and the VSEPR theory. Compare the shapes
of a CO, molecule and a SO, molecule, both of which contain two
oxygen atoms bonded to one other atom.
(4).
3.2.2 Comment on the polarity of both the CO, and SO, molecules. In each
instance, explain your answer with reference to the molecular shape.
(4)
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