Chapter 5- Gas

Question 0

Parameters affecting gas

Answer 0

Pressure
Volume
Temp
Number of moles

Question 1

Properties of gas

Answer 1

1 volume changes with temp and pressure
2 expand to uniformly fill container
3 have no definite volume or shape
4 mix completely with any other gas in any proportions (miscible)
5 much lower density than solids & liquids (g/L)

Question 2

Gas pressure

Answer 2

Pressure=force per area
Collisions with surfaces create pressure.
More particles = higher pressure
More frequent = higher pressure 
Less area = higher pressure

Question 3

Measurement of pressure

Answer 3

Standard atmospheric pressure

The mercury barometer

Question 4

Elevation and atmospheric pressure(atm)

Answer 4

Atmospheric pressure decreases with altitude due to decreased density of gas molecules

Question 5

Boyle’s law

Answer 5

The volume of gas is inversely proportional to applied pressure
T and n are fixed
P1V1=P2V2

Question 6

Charles’s law

Answer 6

The volume of gas is directly proportional to kelvin temperature and extrapolates to zero at zero kelvin
P and n fixed
V1/t1= V2/T2

Question 7

Avogadro’s law

Answer 7

The volume of a gas is directly proportional to the number of moles of has (at low pressures)
P and t fixed
V1/n1 = V2/n2

Question 8

Amonton’s law

Answer 8

Gas pressure is directly proportional to kelvin temp
N and v fixed
P1/T1= P2/T2

Question 9

Genera gas equation

Combining gas laws

Answer 9

P1V1/n1T1 = P2V2/n2T2

Question 10

Ideal gas law

Answer 10

PV=nRT

P= pressure in ATM
V= vol in liters
N= moles
R= 0.08206
T= temp in K

Question 11

Standard temperature and pressure STP

Answer 11

P= 1atm
T = 273k
N= 1
R
=22.41L 
Ideal gas

Question 12

Gas density

Answer 12

D= PM/RT

Question 13

Dalton’s law of particle pressure

Answer 13

Partial pressure = pressure contribution of a gas within a mixture
Pa= NaRT/V total

Question 14

Collecting a gas over water

Answer 14

Ptotal=Pgas-Ph2o

Question 15

Mole fraction

Answer 15

Na = Pa/Ptotal