Chapter 13“The Behavior of Gases”

Chemistry Joke

Oops! I spilled water on my homework.

Kinetic Molecular Theory Gases are hard, spherical particles that:

Have insignificant volume.Are not attracted to or repelled by each other.Move randomly in straight paths.Experience elastic collisions with complete

transfer of kinetic energy

Variables that Describe a GasThe four variables and their common

units:1. pressure (P) in kilopascals - kPa 2. volume (V) in Liters - L3. temperature (T) in Kelvin - K4. amount (n) in moles - molHow are each of these variables related

to each other?

Boyle’s Law Pressure goes up, volume goes down; Pressure goes down, volume goes upEquation: P1V1 = P2V2

Graph of Boyle’s Law

Charles’s Law

The volume of a fixed mass of gas is directly proportional to the Kelvin temperature, when pressure is held constant.

VT

VT

P1

1

2

2 ( constant)

The Combined Gas LawThe combined gas law expresses the relationship between pressure, volume and temperature of a fixed amount of gas.

2

22

1

11

TVP

TVP

Chemistry Joke“Due to budget cuts, science and health will both taught by the chemistry teacher…

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