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Chapter 14: The Behavior of Gases

Created by: CK-12

Garrett Heath. http://www.flickr.com/photos/garrettheath/10262331596/. CC BY 2.0.

Chapter Overview

Gases are compressible because of the large amount of empty space between the particles. Four variables describe the condition of a gas: amount of gas (moles), volume, temperature, and pressure. The gas laws are simple mathematical relationships between the variables. The simplest laws involve two variables changing while two are held constant. The ideal gas law allows any one of the four variables to be determined if the other three are known. Gases are not truly ideal under all conditions, but are more ideal when the pressure is low and the temperature is high. Dalton’s law of partial pressures concerns the pressure of a single gas when it is part of a mixture. The relative speeds of gas molecules are inversely proportional to the square roots of their molar masses according to Graham’s law.

Online Resources

See the following Web sites for appropriate activities:

Pacing the Lessons

Lesson Class Period(s) (60 min)
14.1 Gas Properties 1
14.2 Gas Laws 2
14.3 Ideal Gases 2
14.4 Gas Mixtures and Molecular Speeds 1 – 2

Chemistry Concepts

The table below matches each lesson from the flexbook to the chemistry concepts.

Flexbook Lesson Chemistry Concepts
14.1 Gas Properties 14.1 – 14.2
14.2 Gas Laws 14.3 – 14.7
14.3 Ideal Gases 14.8 – 14.11
14.4 Gas Mixtures and Molecular Speeds 14.12 – 14.15

Chapter Outline

Chapter Summary

Image Attributions


Difficulty Level:

At Grade


Date Created:

Aug 12, 2014

Last Modified:

Oct 20, 2014
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