CAIE A-Level Chemistry 3.6.3 van der Waals’ Forces
Practise classifying intermolecular forces and explaining how electron number, polarity and shape affect their strength.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- AS
Exam points
- use van der Waals’ forces as the generic term for intermolecular forces other than bonding within entities
- identify instantaneous dipole–induced dipole forces in all atoms and molecules
- add permanent dipole–permanent dipole forces for polar molecules and compare strength using size and shape
3.6.3—Van der Waals’ forces as the intermolecular question 1
The halogens chlorine, bromine and iodine show trends in chemical and physical properties down the group.
Table 3.1 shows some properties of chlorine, bromine and iodine.
Table 3.1
Iodine monobromide, IBr , is a dark red solid that melts near room temperature.
IBr reacts with propene. The mechanism for this reaction is the same as the mechanism for that of HBr with propene.
Identify all the intermolecular forces that exist between molecules of IBr .
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