Module #12: The Gas Phase

Question 1

Pressure

Answer 1

The force per unit area exerted on an object

Question 2

What does 1.000 atm equal?

Answer 2

101. 3 kPa (kilo Pascals)
102. 0 torr
103. 0 mmHg

Question 3

What is Boyle’s Law?

Answer 3

PV = constant

Question 4

Charles’ Law

Answer 4

At constant pressure, the temperature and volume of a gas are linearly proportional

Question 5

Extrapolotition

Answer 5

Following an established trend in the data even though there is no data available for that region

Question 6

Standard Temperature and Pressure (STP)

Answer 6

A temperature of 273 K and a pressure of 1.00 atm

Question 7

Dalton’s Law of Partial Pressures

Answer 7

When two or more ideal gases are mixed together, the total pressur of the mixture is equal to the sum of the pressures of each individual gas

Question 8

Vapor Preasure

Answer 8

The pressure exrted by the vapor which sits on top of any liquid

Question 9

Boiling point

Answer 9

The temperature at which the vapor pressure of a liquid is equal to normal atmospheric pressure

Question 10

Ideal gas constant

Answer 10

R = 0.0821 • L•atm

Mole • K

Question 11

What does the equation

P = ^F/_A

Mean?

Answer 11

P is preasure, F is force, and A is the area on which the force is exerted. It means that the you can determine the preasure exerted on an object by deviding the force by the area.

Question 12

What does Charles’s Law

^V/_T = Constant

Mean?

Answer 12

V is the volume of gas, and T is it’s temperature.

It means that as long as the pressure stays the same, the volume of the gas devided by the temperature of the gas will increas uniformly

Question 13

What does the combined gas law

^P1V1/_T1 = ^P2V2/_T2

Mean?

Answer 13

P₁, V₁, and T₁ are the preasure, volume, and temperature of a gas under one set of conditions, while P₂,V₂, and T₂ are the preasure, volume, and temperature of the gas under any other set of conditions.

Question 14

What does the equation

P₁ = X₁P_T

Mean?

Answer 14

P₁ is the partial pressure, X₁ is the mole fraction, and P_T is the Total preasure

It means that the partial preasure of a gas in a mixture is eaqual to the mole fraction of that gas multiplied by the total preasure of the mixture.

Question 15

What does the ideal gas law

PV = nRT

Mean?

Answer 15

P is the pressure of the gas, V is is it’s volume, T is it’s temperature, n is the number of moles, and R is the ideal gas constant

It is used to convert measurements of gasses into moles (or visa versa).