IB Chemistry SL 1.1.2 Kinetic Molecular Theory

Practise using the kinetic molecular model to explain solids, liquids, gases and transitions between them. Strong answers link an observed property—such as flow, fixed volume or…

Syllabus
First assessment 2025
Objective
1.1.2
Level
SL

Exam points

  • explain flow, shape and compressibility through particle movement, spacing and attraction
  • name melting, freezing, vaporisation, condensation, sublimation or deposition from a change
  • connect a physical observation during a state change to the particle-level model

1.1.2—Kinetic molecular theory question 1

[Maximum number: 2]

Alkanes are commonly occurring organic compounds.

The first four straight chain alkanes are gases at room temperature.

Boiling points of straight chain alkanes

Boiling points of straight chain alkanes

Explain why the volume occupied by a sample of propane increases sharply when the sample is heated up from 200 to 250 K at constant pressure.

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