
Gas mixtures are __ and __.

Gases above us __ on us, causing __ affected by the __.
 push down
 pressure
 gravitational pull

What is the typical tool for measuring pressure?
barometer

What is the amount of mercury that goes in a barometer?
760 mm

In a barometer, as the pressure incresaes, what happens to mercury?
As the pressure decreases, what happens to mercury?
 pressure increses, mercury goes up; greater height
 pressure decreases, mercury goes down; smaller height

Ideal Gas
a gas whose behavior follows the gas laws exactly; independent; a gas that doesn't interact with anything

THe physical properties of a gas can be defined by four variables:
 pressure
 temp in K
 volume
 number of moles

What is the formula for the Combined Gas Law?
(P1V1/T1)=(p2V2/T2)

Another name for Boyle's Law?
Relationship between volume and pressure?
 PressureVolume Law
 inverse relationship

Another name for Charles' Law?
Relationship between volume and temperature?
 Temperature Volume Law
 directly proportional

Significance of absolute zero?
no motion

Formula for:
Boyle's Law
P1V1=P2V2

Formula for:
Charles' Law
V1/T1=V2/T2

Formula for:
Avogadro's Law
V1/n1=V2/n2

Ideal gases obey an equation incorporating the laws of __, __, and __.
The formula is:
 Charles, Boyle, and Avogadro
 PV=nRT

Formula for:
Density and Molar Mass Calculations
d=mass/ volume= (n x M)/ V = (P x M)/ (R x T)

You can calculate the __ or __ of a gas. The density of a gas is usually very __ under atmospheric conditions.

In __, for a constant temperature and pressure, volume is __ to moles.
 gas stoichiometry
 proportional

Mole Fraction
 X_{i}= (n_{i})/(n_{total}) or
 X_{i}= P_{i}/P_{total}

Kinetic Molecular Theory:
What does it present?
physical properties of gases in terms of hte motion of individual molecules

Postulates of KineticMolecular Theory:
1
A gas consists of tiny particles, either atoms or molecules, moving about at random

Postulates of KineticMolecular Theory
2
The volume of hte particles themselves is negligible compared with the total volume of the gas; most of the volume of a gas is empty space

Postulates of KineticMolecular Theory
3
The gas particles act independently of one another; there are no attractive or repulsive forces between them

Postulates of KineticMolecular Theory
4
Collisions of the gas particles, either with other particles or with the walls of a container, are elastic (constant temp)

Postulates of KineticMolecular Theory
5
The average kinetic energy of the gas particles is proportional to the Kelvin temperature of the sample

What is RootMeanSquare
measure of the average molecular speed

Diffusion
mixing of different gases by random molecular motion and collision

Effusion
when gas molecules escape without collision, through a tiny hole into a vacuum

Graham's Law
rate of effusion is proportional to its rms speed

Deviation results from assumptions about ideal gases. What are the two
 molecules in gaseous state do exert any force, either attractive or repulsive on one another
 Volume of the molecules is negligibly small compared with that of the container

The volume of a real gas is __ than predicted by the ideal gas law.
larger

At lower pressure, the volume of the gas particles is __ compared to the total volume.
negligible

At higher pressure, the volume of the gas particiles is __ to the total volume.
more significant compared

The volume ofa real gas at high pressure is __ than the ideal value.
larger

Attractive forces between particles become more important at __.
higher pressures

