Chemistry 38

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Inter-molecular Forces and Phase Changes

Intermolecular forces (IMF) are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighboring particles – such as atoms or ions. While most substances consisting of small molecules are gases at normal temperatures and pressures, water is a liquid. Why? The answer has to do with intermolecuar forces – those forces which exist between the molecules.

NOTE: intramolecular forces are forces inside the molecules, holding them together – whereas intermolecular forces are between molecules.

Lesson 1 (or “Day 1”) Material
Lesson 2 (or “Day 2”) Material
Lesson 3 (or “Day 3”) Material
Lesson 4 (or “Day 4”) Material

5:18 What Are Intermolecular Forces

7:00 Intermolecular Forces

10:53 Intermolecular Forces and Boiling Points



Compare Contrast and Debate

Kickoff Debate Background: xx
Intramolecular bonds are the bonds that hold atoms to atoms and make compounds. There are 3 types of intramolecular bonds: covalent, ionic, and metallic. (

  • Position A: Initially, metallic bonds do not need to be introduced to new chemistry students.
  • Position B: Metallic bonds should be introduced first to new chemistry students – followed by covalent and ionic bonds.

Resources Documents and Links

Notes and Notices

Instructor Emphasis:

  • Science & Engineering Practice: Obtain, evaluate, and communicate information.
  • Cross-Cutting Concept: Systems and System Models.