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

Announcements Textbook HW due tomorrow (Friday) Lon-capa HW #3 (Type 1) due Monday, September 18 by 7:00 p.m. Lon-capa HW #3 (Type 2) due Wednesday, September 20 by 7:00 p.m. Lab write-up for Gases Lab due Wednesday, September 20 at the start of lab Pre-lecture assignments (as always)

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Barometric Pressure in Urbana, IL = 29.87 in (758.7 mm Hg) http://ap-physics.david-s.org/simple-mercury-barometer/

Clicker #1 Is the pressure in the larger balloon greater than, less than, or about equal to the pressure in the smaller balloon? A) greater than the smaller balloon B) less than the smaller balloon C) equal to the smaller balloon

Clicker #2 As the number of moles of carbon dioxide gas increases, the pressure in the bag will A) increase B) decrease C) stay the same

Clicker #3 If the volume of gas inside the syringe decreases, the pressure will A) increase B) decrease C) stay the same

Clicker #4 If the temperature of the gas inside the balloon decreases, the volume will A) increase B) decrease C) stay the same

Clicker #5 If the temperature of the gas inside the can increases, the pressure will A) increase B) decrease C) stay the same

Sample Problem: Chapter 13 #44 If 2.71 g of argon gas occupies a volume of 4.21 L, what volume will 1.29 moles of argon occupy under the same conditions?

Sample Problem: Chapter 13 #31 a. A gas occupies 2.03 L of space at 24°C. If the gas has expanded to a volume of 3.01 L after heating, what temperature (in °C) does the gas reach?

Sample Problem: Chapter 13 #22 If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas?