CHM 002 Workshop @ Chem Center
Topic: Intermolecular Forces Chapter 6
Introduction to Intermolecular Forces
• The term “INTERmolecular forces” is used to describe the forces of attraction
BETWEEN atoms, molecules, and ions when they are placed close to each other
• This is different from INTRAmolecular forces which is another word for the covalent
bonds inside molecules.
• When two particles experience an intermolecular force, a positive (+) charge on one
particle is attracted to the negative (-) on the other particles.
• When intermolecular forces are strong the atoms, molecules or ions are strongly
attracted to each other, and draw closer together. These are more likely to be
found in condensed states such as liquid or solid.
• When intermolecular forces are weak, the atoms, molecules or ions do not have a
strong attraction for each other and move far apart.
Q1 State the difference between intermolecular forces and intramolecular forces in terms of
where they occur at the molecular level.
Q2 What is the minimum number of molecules (or atoms, ions) needed for an intermolecular
force?
Q3 When two particles experience an intermolecular force, how are the two particles
attracted to each other?
Q4 Would it be easier to separate two molecules experiencing a strong intermolecular force
or a weak intermolecular force?
