IB Chemistry SL 2.2.8 Intermolecular Forces

Practise identifying London dispersion, dipole-induced dipole, dipole-dipole and hydrogen-bonding interactions from molecular structure. Compare their strength using electron…

Syllabus
First assessment 2025
Objective
2.2.8
Level
SL

Exam points

  • deduce the intermolecular forces present from molecular polarity and functional groups
  • compare London-force strength using electron count, molecular size and contact surface
  • draw a hydrogen bond from an O-H or N-H donor to a valid lone-pair acceptor

2.2.8—Intermolecular forces (IMF) question 1

[Maximum number: 1]

Ethyne, C2H2\mathrm{C}_{2} \mathrm{H}_{2}, reacts with oxygen in welding torches.

Identify the type of interaction that must be overcome when liquid ethyne vaporizes.

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