Unit 3: Gases

Learning Objectives for Unit 3 is located here.

Gases were arguably the first state of matter that early chemists explored and experimented with to better understand their properties and behavior. We begin our chemical studies like those came before us: with gases. Topics will include: properties of gases, gas relationships (combined gas law, ideal gas law), applications of the idea gas equation, gas mixtures and partial pressures, kinetic molecular theory of gases, and molecular effusion and diffusion.

Notes & Examples

Unit 3 Notes

Example problems (compiled), U3

Selected slides/ images


Gas Relationships

Excel Tutorial

Kinetic Molecular Theory

Effusion & Diffusion ppt


Reference Handouts

Vernier Logger Pro Download

Vapor Pressure of Water


How to Solve 🆘

    • Calculate P, V, n, or T using the ideal-gas equation.
    • Calculate the density or molecular weight of a gas.
    • Calculate the volume of gas consumed or formed in a chemical reaction.

Practice Problems

Combined Gas Law KEY

Partial Pressures

Graham's Law



*denotes supplemental material, not distributed in class

Assigned Textbook Problems

Chapter 10: Gases #9, 11, 25, 31, 37, 49, 57, 67, 75, 83, 91, 105

Labs/ Demonstrations

Video Resources