IB Chemistry SL 2.2.1 Covalent Bonding

Practise describing a covalent bond as attraction between a shared electron pair and both nuclei, then construct Lewis formulas from valence electrons. Show single or multiple…

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