IB Chemistry SL 2.2.1 Covalent Bonding Question Bank

Practise IB Chemistry SL 2.2.1 by counting valence electrons, drawing Lewis structures and explaining how shared electron pairs and lone pairs satisfy the octet rule.

Exam points

describe covalent bonding through attraction between a shared pair and both nuclei
count valence electrons before placing bonds, lone pairs and any overall ionic charge
draw single, double or triple bonds so each relevant atom achieves an octet

[Maximum number: 1]

Ethyne, $\mathrm{C}_{2} \mathrm{H}_{2}$ , reacts with oxygen in welding torches.

Deduce the Lewis (electron dot) structure of ethyne.

$\mathrm{H}: \mathrm{C}:: \mathrm{C}: \mathrm{H} / \mathrm{H}-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}$

Marking guidance:

Accept any valid combination of lines, dots and crosses.

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2.2.1—Covalent bonding question 1