Types of Intermolecular Bonds
Van der Waals forces:
•intermolecular forces of attraction
Examples: London forces, dipole-dipole forces, hydrogen bonds
LONDON FORCES
• London forces are weak
because (1) partial charges are
involved and (2) because they
are temporary. They arise from
the random movement of
electrons in atoms and
molecules.
a) small collection of nonpolar molecules
b) a nonpolar molecule may temporarily have a slight excess of
electrons in one portion of the molecule
c) During the brief interval that these temporarily polar molecules exist,
they are attracted to each other
Hydrogen bonds: strongest intermolecular bonds