Pressure
Theory
Laws
Problems
100
Force exerted by a gas molecule as they collide with the surfaces of their containers
Pressure
100
What is an ideal gas?
hypothetical gas whose molecules have no volume, experience no imf, and undergo perfectly elastic collisions
100
Why must the temperature be in Kelvin?
Kelvin reflects the kinetic energy of a gas particle
100
If you have a cylinder of gas at 3.50 atm and 23 °C, what temperature would it need to be
to reach 4.50 atm?
380 K or 108 C
200
The force per unit area exerted by the weight of the Earth's atmosphere. What is the standard value for STP? What other pressure unit is approximately eaqual?
Atmospheric pressure. 1 atm. Bar
200
What is a real gas? When are the effects most prominent?
a gas whose molecules have a set volume, and expirence intermolecular forces which cause it to deviate from ideal gas behavior. Most prominent at high pressure and low temperature.
200
What is the formula for an ideal gas?
PV=nRT
200
If you have a 5.75 L balloon at 2.80 atm and 23 °C, how many moles of gas are in the
balloon?
0.622 mol
300
Pressure defined as newton of force per square meter of area. 101325 at STP
Pascal
300
What are the five postulates of the kinetic molecular theory of gases?
1. gases consist of tiny particles in constant random motion
2. negligible volume
3. experience no intermolecular forces.
4. undergo perfectly elastic collisions
5. average kinetic energy is proportional to temperature.
300
What is dalton's law of partial pressure?
Pt=p1+p2+p3+...
300
What is the mass of 5.9 L of O2 at STP?
8.32 g
400
Unit of pressure defined at 760 of standard atmospheric pressure
torr
400
What is the Joule Thompson effect
When a real gas expands from a high pressure environment to a low pressure environment, the temperature will change
400
What is the combined gas law?
P1V1/n1T1=P2V2/n2T2
400
If you fill your car’s tires to 48 PSI* in July at a temp of 34 °C, what will your tire’s
pressure be in January at a temp of 3.4 °C? (*Note: when you set your tires to 33 PSI,
that is actually 48 PSI since the tire pressure gauge is zeroed to atmospheric pressure, not
vacuum
43 psi
500
unit of pressure representing the force exerted by 1 mm of mercury under standard gravity. closely related to torr
mmHg
500
Draw a phase diagram of water
500
If the temperature of a vapor increases, what will the pressure do?
increase; directly proportional
500
What is the density of CO2 at STP?
1.94 g/L