1. Announcements



Exam #1: Tuesday, September 24 th,
7:00-8:15pm, locations on website
Conflict Exam: 5:15-6:30pm, 103
Transportation Bldg, sign up outside of
101 CA until noon on 9/24
Review Questions for Exam 1 due
tomorrow by 5:00pm

2. Q & A Review Sessions
Now posted on course website under Exam Information

3. Kinetic Molecular Theory
Gases are made of particles in
constant random motion.
 Temperature is a measure of
random kinetic energy.
 Pressure is due to collisions of
gas particles with the
container.


4. KMT (assumptions)
Assume that gas particles exert
no attractive forces (elastic
collisions).
 Assume the volume of the gas
particles is negligible (zero).


5. Clicker #1
He

Xe
The two balloons above are the same size but contain different
gases. How do the pressures inside the balloons compare?
A)
B)
C)
D)
The pressures are the same.
The balloon with helium (He) has the greater pressure.
The balloon with xenon (Xe) has the greater pressure.
Not enough information is given to answer this question.

6. Clicker #2
He

Xe
The two balloons above are the same size but contain different
gases. Which gas particles will hit the walls of the balloon harder?
A)
B)
C)
They both hit with the same amount of force.
The helium particles will hit harder.
The xenon particles will hit harder.

7. Clicker #3

You are holding three balloons each containing
the same mass of gas. One balloon contains
hydrogen gas, one contains helium, and one
contains oxygen. Which balloon is the largest?
A)
B)
C)
D)
The hydrogen balloon is the largest.
The helium balloon is the largest.
The oxygen balloon is the largest.
All of the balloons are the same size.

8. Here are some additional problems that we didn’t get
to in lecture…

A 50.0-L steel tank contains 186
mol N2 and 145 mol O2 at 24oC.
What is the partial pressure of each
gas in the tank? What is the total
pressure in the tank?

9. Consider a sample of gas at 2.00
atm in a 35.0-L container at 25.0oC.
You transfer all of the gas to a
70.0-L container and you heat the
gas to 50.0oC.
Determine the new pressure of the
gas.

10. Consider a sample of gas at
5.40 atm in a 1.00-L rigid
container at 40.0oC. You heat
the gas to 80.0oC. What
happens?
Solve for the new condition.

11. Consider a sample of gas at
5.40 atm in a 1.00-L container
fitted with a piston at 40.0oC.
You heat the gas to 80.0oC.
What happens?
Solve for the new condition.