IB Chemistry HL 1.5.2 Real Gases Question Bank
Practise IB Chemistry HL 1.5.2 with SL and HL questions linking real-gas deviation to molecular volume, polarity, pressure and temperature.
- Syllabus
- First assessment 2025
- Course
- Chemistry HL
- Level
- HL
Practise IB Chemistry HL 1.5.2 with SL and HL questions linking real-gas deviation to molecular volume, polarity, pressure and temperature.
Alkanes are commonly occurring organic compounds.
The first four straight chain alkanes are gases at room temperature.

Boiling points of straight chain alkanes
Outline why the volume occupied by propane(g) at very high pressure is higher than the value calculated using PV=nRT.
not behaving as an ideal gas «at very high pressure»
ideal gas molecules have no volume
OR
volume of «propane» molecules is not negligible
Marking guidance:
Accept propane is a real gas for M1.