# Chapter 5- Gas Flashcards Preview

## Chem 144 > Chapter 5- Gas > Flashcards

Flashcards in Chapter 5- Gas Deck (16)
0
Q

Parameters affecting gas

A

Pressure
Volume
Temp
Number of moles

1
Q

Properties of gas

A

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)

2
Q

Gas pressure

A
```Pressure=force per area
Collisions with surfaces create pressure.
More particles = higher pressure
More frequent = higher pressure
Less area = higher pressure```
3
Q

Measurement of pressure

A

Standard atmospheric pressure

The mercury barometer

4
Q

Elevation and atmospheric pressure(atm)

A

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

5
Q

Boyle’s law

A

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

6
Q

Charles’s law

A

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

7
Q

A

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

8
Q

Amonton’s law

A

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

9
Q

Genera gas equation

Combining gas laws

A

P1V1/n1T1 = P2V2/n2T2

10
Q

Ideal gas law

A

PV=nRT

```P= pressure in ATM
V= vol in liters
N= moles
R= 0.08206
T= temp in K```
11
Q

Standard temperature and pressure STP

A
```P= 1atm
T = 273k
N= 1
R
=22.41L
Ideal gas```
12
Q

Gas density

A

D= PM/RT

13
Q

Dalton’s law of particle pressure

A

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

14
Q

Collecting a gas over water

A

Ptotal=Pgas-Ph2o

15
Q

Mole fraction

A

Na = Pa/Ptotal