1. Essential Questions
How does the Kinetic molecular theory explain the behavior of gases?
How does the kinetic molecular theory explain the phase changes of matter?
What is the relationship that exists between pressure, temperature, volume and number of particles in an ideal gas?
How do the gas laws relate to my real life experiences?
How is the behavior of gases crucial to life on earth?

2. Kinetic Molecular Theory
Kinetic – motion
Molecular – having to do with molecules (particles)
Theory – a generalization or explanation of a body of events or phenomena

3. History of KMT
Late 1800’s scientists created a theory to account for the behavior of atoms and molecules that make up matter.
The history of chemistry was founded on experimentation and observation.
Scientists built upon one another’s findings.

4. Kinetic Molecular Theory
Ideal
Real
Complies to the “model” description of something
Perfect
May exist under certain conditions
Rare
Hypothetical
what exists out in the world
Not perfect
Most common

5. 5 assumptions of KMT
1. Gases consist of large numbers of tiny particles that are far apart relative to their size.
2. Collisions between gas particles and between particles and container walls are elastic collisions.
An elastic collision has no net loss of total kinetic energy

6. 5 Assumptions of KMT
3. Gas particles are in continuous, rapid, random motion.
4. There are no forces of attraction between gas particles.
5. The temperature of a gas depends on the average kinetic energy of the particles of gas

7. The Nature of Gases Expansion
Fluidity – able to flow, like when I poured the gases
Low density
Compressibility

8. KMT
Although the kmt deals with “hypothetical, ideal” gases, some gases come very close to ideal behavior under certain conditions.
Noble gases are more likely to act like ideal gases because they have little attraction for each other.
Other conditions, high temp and low pressure

9. Diffusion
The spontaneous mixing of the particles of two substances caused by their random motion.

10. Effusion
The process by which gas particles pass through a tiny opening

11. Apply
Using the postulates of the kinetic molecular theory, explain very specifically how the fragrance from the candle at one end of the room is able to be smelled throughout the room. (How and why did it travel?)