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Kinetic Molecular Theory

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Page 1: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Page 2: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

So far we have considered “what happens,” but not “why.”

In science, “what” always comes before “why.”

Page 3: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Assumptions:

1. Gas particles are in rapid motion, colliding with container walls.

Page 4: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Page 5: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Assumptions:

2. Gas particles have negligible size compared to the distances between them.

Page 6: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Animation: Visualizing Molecular Motion (many molecules)

Page 7: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Assumptions:

3. Gas particles have no attraction for one another.

Page 8: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Assumptions:

4. Absolute temperature of the gas is a measure of the average kinetic energy of the gas particles.

Page 9: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Kinetic Molecular Theory

Animation: Kinetic Molecular Theory/Heat-Transfer

Page 10: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Molecular View of The Ideal Gas Law

Page 11: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Which of the following best represents the mass ratio of Ne:Ar in the balloons?  1:1

1:2

2:1

1:3

3:1

VNe = 2VArNe

Ar

React 5

Page 12: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Video: Collapsing Can

Page 13: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

On a beautiful autumn day in Champaign, IL, you are holding two balloons, each with 15 mol of gas.

Which balloon is larger? The one filled with neon

gas.The one filled with argon

gas.

React 6

Page 14: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

On a beautiful autumn day in Champaign, IL, you are holding two balloons, each with 15 mol of gas.

Estimate the volume of each balloon.

React 6

Page 15: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

What mass of neon is in the balloon? <1.0g

1.0g

>1.0g

VHe = VNe Ne

He1 gram

React 7

Page 16: Kinetic Molecular Theory. So far we have considered “what happens,” but not “why.” In science, “what” always comes before “why.”

Determine the mass of neon in the balloon.

VHe = VNeNe

He1 gram

React 7


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