Vapor Pressure and Boiling Point
The pressure of vapor present at equilibrium with its liquid is called the equilibrium vapor pressure – or, more commonly – the vapor pressure of the liquid. Vapor pressures of liquids vary widely. Liquids with high vapor pressures are called volatile – that is, they evaporate rapidly. Vapor pressure of a liquid at a given temperature is determined by the intermolecular forces acting among the molecules. There is a relationship between vapor pressure and boiling point of a liquid. This topic explores vapor pressure, and its relationship to boiling point.
Lesson 1 (or “Day 1”) Material
Lesson 2 (or “Day 2”) Material
- Day 2 Instructor Presentation
- Day 2 Student Handout
- Day 2 Rubric
- Read Chem 39 – Boiling Point
- Read Chem 39 – Relationship of These
- Read Chem 39 – Vapor Pressure
Lesson 3 (or “Day 3”) Material
Lesson 4 (or “Day 4”) Material
insert videos here …
4:49 Vapor Pressure 101
5:34 Demonstration of Vapor Pressure
3:26 Vapor Pressure
Compare Contrast and Debate
Kickoff Debate Background:
Vapor pressure is the pressure caused by the evaporation of liquids. Three common factors that influence vapor press are surface area, intermolecular forces and temperature. The vapor pressure of a molecule differs at different temperatures. (BrightStorm)
- Position A: A variety of liquids and gases should be studied at ambient conditions before exploring temperature and pressure effects.
- Position B: A single liquid or gas should be selected for examining at many temperature and pressure combinations prior to examining multiple liquids or gases.
Resources Documents and Links
Notes and Notices
- Science & Engineering Practice: Use mathematical and computational thinking.
- Cross-Cutting Concept: Stability and Change.