Chapter 14 The Behavior of Gases. Did you hear about the chemist who was reading a book about Helium? He just couldn't put it down. . 14.1 Properties of Gases. OBJECTIVES: Explain why gases are easier to compress than solids or liquids are
Did you hear about the chemist who was reading a book about Helium?
He just couldn't put it down.
Shows spacing between
O2 and N2 molecules
1. ________(P) in kilopascals
2. volume (V) in Liters
3. temperature (T) in Kelvin
4. ______(n) in moles
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Gas pressure is ________proportional to volume, at a constant _________(Check out this cool animation)
Pressure x Volume = a constant
Equation: P1V1 = P2V2 (at a constant T)
As volume increases, pressure decreases
An inverse relationship!
Charles’ Law Animation
Kelvin = C + 273
°C = Kelvin - 273
The combined gas law expresses the relationship between ______, volume and _________of a fixed amount of gas.
See Sample Problem 14.4, page 424 if needed
P x V
R x T
n (moles) = mass (g)
molar mass (g/mol)
PV = nRT P =
- otherwise there would be no liquids
For a mixture of gases in a container,
PTotal = P1 + P2 + P3 + . . .
+ 1 atm
= _ atm
+ 3 atm
Two gases mix after the wall separating them is removed.
- balloons slowly lose air over time
Diffusion and effusion are explained by the next gas law: Graham’s