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Structure 2.2.9—Given comparable molar mass, the relative strengths of intermolecular forces are generally: London (dispersion) forces < dipole–dipole forces < hydrogen bonding.


Here are experiments our science specialists have selected to support this IB* topic.

Evaporation and Intermolecular Attractions

Experiment #9 from Chemistry with Vernier

In this experiment, you will

  • Study temperature changes caused by the evaporation of several liquids.
  • Relate the temperature changes to the strength of intermolecular forces of attraction.

Accelerant Evaporation

Experiment #1 from Forensic Chemistry Experiments

  • Identify the likely accelerant used in an arson.
  • Justify your solution, based on evaporation rate.
  • Understand that evaporation rate is a characteristic property of a liquid related to intermolecular forces

Educational Standard
International Baccalaureate (IB) 2025
Organizing concepts
Structure 2. Models of bonding and structure
Structure 2.2—The covalent model
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.