Displayed formulae
3 marks · EasyAnswer the following about the typical bonding in displayed formulae.
(a)[1 mark]
State the typical number of bonds formed by a hydrogen atom.
(b)[1 mark]
State the typical number of bonds formed by a carbon atom.
(c)[1 mark]
State the typical number of bonds formed by an oxygen atom.
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(a) 1
(b) 4
(c) 2
Common mistakes: Hydrogen or oxygen with wrong values (e.g., H = 2, O = 1)
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Marking points
B1 (a) · 1 mark · Correctly states 1 bond for hydrogen atom.
B2 (b) · 1 mark · Correctly states 4 bonds for carbon atom.
B3 (c) · 1 mark · Correctly states 2 bonds for oxygen atom.
Worked solution
(a) Hydrogen: 1 bond. (b) Carbon: 4 bonds. (c) Oxygen: 2 bonds.