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ZingPath: Gas Laws

Kinetic Molecular Theory

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Gas Laws

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Lesson Focus

Kinetic Molecular Theory


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You will get to explore the nature of gases through a series of simulated experiments, and gain understanding of the gas laws.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain the effect of temperature on molecular speed.
  • Explain the kinetic theory and ideal gas assumptions.

Everything You'll Have Covered

What is kinetic molecular theory and why did scientists propose this model?

~ Kinetic molecular theory is a model that explains the characteristics of gases by examining the motion of the small particles that make up gases.

What do we know about gas molecules and their behaviors and characteristics?

~ Gases are made up of many molecules, but the volume of these molecules is negligible compared to the volume of the containers they occupy. Interactions between gas molecules are so few that they are also negligible. Gas molecules are in constant random motion. Collisions between gas molecules are elastic. Their total kinetic energy is conserved.

What is the relationship between gas molecules, particles, and temperature?

~ The average kinetic energy of gas molecules is directly proportional to the temperature of their environment. At a given temperature, all gases have the same average kinetic energy. As a gas sample is heated in a closed container, the kinetic energy of the gas particles increases, so they hit the walls of the container more frequently. As temperature increases so does the pressure in the closed container.

What are the physical properties of gas?

~ One physical property of gas is that pressure is directly proportional to temperature. Another physical property of gas is diffusion. Diffusion refers to gas particles moving in all directions without any molecular interaction apart from collisions.

What are ideal gases?

~ Ideal gases are gases that fulfill the assumptions of kinetic molecular theory.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be familiar with the following terms: assumption, chemistry, and gases.
Course Chemistry
Type of Tutorial Animation
Key Vocabulary assumption, chemistry, gases