Gases
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What are some properties of gasses?
 They expand to completely fill and take shape of their container
 Low density (much less than solid or liquid)
 Compressible
 Gaseous mixtures are always homogeneous

Pressure
 The total force applied to a certain area
 _{Larger force= larger pressure}
 Smaller area= larger pressure

What causes gas pressure?
By the colliding of gas molecules with the container or surface

What causes gas pressure to rise?
More forceful collisions or more frequent collisions of gas molecules

What is used to measure air pressure?
Barometer

Higher altitude =?
Decreased air pressure

1 standard atmosphere(atm) is equivalent to what amount of torr?
760.0 torr

1atm is equivalent to how much psi and pa?
1atm = 14.69 psi = 101,325pascals

What does psi stand for?
Pounds per square inch

What does a manometer measure?
Measure the atmospheric pressure of gas sample relative to the atmospheric pressure

How would you convert 28psi to atm?
 Use equivalence statements.
 So you know 1atm is 1.000 for ever 14.69psi
 Use the equation to cancel out units
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How would you convert 1.9atm to torr
 You use the equivalence statement 1.000atm = 760.0torr
 Set up the equation and cancel out units

Convert from 1.9 atm to pa
 Use the equivalence statement 1.000atm = 101,325pa
 Cancel out the units


What does R in the Ideal Gas law equation stand for?
 R= Ideal Gas Constant
 Its equal to = 0.08206 Latm/Mole K

What is Boyle's law?
 State pressure is inversely proportional to volume.
 If pressure is increased, volume decreases.
 P_{1}V_{1}=P_{2}V_{2}
 or

When using equations for gas, what must you do to all temperature?
Convert to kelvins
If C add 273