1. Creating a Positive Learning Environment for Everyone
Be respectful of your classmates
Save conversation for clicker portions of lecture
Put cell phones in “airplane” mode
Turn off tablets
Close laptops

2. Announcements
Exam #1: Tuesday, September 26th, 7:00-8:30pm, locations posted on course website under “Exam Information”
Conflict Exam: 5:00-6:30pm, sign up 1026 Chem Annex until noon on 9/26
Q & A Review Session times – Posted

3. Still Due This Week:
LON-CAPA HW #3 (Type 2) due Wednesday by 7:00 p.m.
Lab write-up for Gases Lab due Wednesday (tomorrow) at the start of lab
Prelecture Assignment
Review Questions for Exam 1 due Friday by 5:00 p.m. (in LON-CAPA)
Text HW due Friday (assigned by TA)

4. Self check: Are each of these formulas correct?
Number
Name
Formula 1
Chromium(II) oxide
Cr2O 2
Silver nitrate
AgNO3 3
Nitrogen monoxide NO 4
Aluminum sulfate
AlSO4

5. Clicker #1
0°C to 40°C is double the temperature of 0°C to 20°C. Does this mean you have twice the amount of kinetic energy in your system?
A) Yes. If the temperature doubles then the kinetic energy must also double. They are directly related.
B) No. Temperature is related to the heat energy of the gas particles, not the kinetic energy of the gas particles.
C) No. Temperature is related to the kinetic energy of the gas particles but must be in relationship to the Kelvin scale.

6. Sample Problem #1 Clicker #2
A gas occupies a volume of L at atm. What will be its volume, at constant temperature, if the pressure is changed to atm?
Before any calculations are made, do you predict that the volume will increase, decrease, or stay the same?
A) increase
B) decrease
C) stay the same

7. Sample Problem #2
A gas sample containing 1.50 moles of gas at 400. torr and 25°C. Some gas is added to the same container and the temperature is increased to 50.°C. If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant volume container.

8. Sample Problem #3
Determine the size of a balloon filled with 4.00 moles of helium gas. Room conditions are 760 mm Hg and 22oC.
Talk about lab write up here! Estimation! Estimate the mass of gas that fits the volume of your head….

9. Clicker #3
At instant the mouth of the can hits the cold water, the temperature of the gas inside the can decreases. Do the moles of gas in the can increase, decrease, or stay the same?
A) increase
B) decrease
C) stay the same