6.1: Intermolecular Forces The physical properties of condensed matter (liquids and solids) can be explained in terms of the kinetic molecular theory. In a liquid, intermolecular attractive forces hold the molecules in contact, although they still have sufficient kinetic energy to move past each other. Intermolecular attractive forces, collectively referred to as van der Waals forces, are responsible for the behavior of liquids and solids and are electrostatic in nature. 6.E: Intermolecular Forces and Liquids and Solids (Exercises) These are homework exercises to accompany the Textmap created for "Chemistry" by OpenStax. 6.S: Study Guide