Chemistry Module 12

What is the definition of pressure?
The force per unit are exerted on an object.
What are the units that can measure pressure?

Pascal (Pa)

Atmospher (atm)

Torr (torr)

Millimeters of mercury (mmHg)


Study Boyle’s law and how it relates to volume


Page 384 and 385

If pressure is decreased, the volume is of the gas will increase


Vice versa


If the pressure is increased, the volume of the gas will decrease.



What is the mathematical equation to express Boyle’s law?
P1V1 = P2V2
What did Jaques Charles added to the investigation of gas and volume?
The effects of temperature on a gas and the volume.
Define Charles’s Law
At constant pressure, the temperature and volume of a gas are linearly proportional.
How can Charles’s law be expressed mathematically?


                  T   = constant





V1    V2

T1 = T2

In an “absolute temperature scale”, what temperature will  you not be able to cool a gas to?

273.14° C


or 0.00 Kelvin

Define extrapolation
Following an established trend in the data even though there is no data available for that region
Explain how the Combined Gas Law combines Boyle’s law and Charles’s law together?
The combined gas las will measure the pressure, the volume and the temperature of a gas.
How can the Combined Gas Law be mathematically expressed?


                   T     = constant





P1V1    P2V2

T  =  T2

What temperature scale must you use to use any of the equations you learned in this module?



To convert to Kelvin, add 273.15 to the Celsius temperature.

Study Example 12.1 on pages 392, 393, and 394

What makes a gas an ideal gas?


Hint: you will not have to memorize these rules but be able to recognize these rules in a true/false statement

Go to page 394 and study the 3 properties of an ideal gas
Why is a “Standard Temperature and Pressure (STP) important?
It is a reference to determine whether or not a gas will behave in an ideal manner

Define Dalton’s law


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

How can Dalton’s law be expressed mathematically?


PT = P1 + P2 + P3 ….
Define vapor pressure
The pressure exerted by the vapor which sits on top of any liquid
When does vapor pressure increase?
When the temperature of the liquid increases
Define boiling point
The temperature at which the vapor pressure of a liquid is equal to normal atmospheric pressure
Study example 12.2 on page 398
Study example 12.3 on page on pages 399, 400
Study example 12.4 on pages 401 and 402
How is the Ideal Gas Law expressed mathematically?

PV = nRT



                  R = 0.0821 mole *K



Study example 12.5 on pages 403 and 404
Study examples 12.6 on pages 406, 407, and 408

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