As always n n OWL LonCapa assignments Lecture

As always… n n OWL Lon-Capa assignments Lecture videos Textbook n n Read Do text homework 1

Chapter 5: Challenge Problem 2

The Partial Pressure of each Gas in a Mixture of Gases in a Container Depends on the Number of Moles of that Gas

Kinetic Molecular Theory Gases consist of particles in constant random motion. n Temperature is a measure of average kinetic energy. n Pressure is due to collisions of gas particles with the container. n 4

KMT (assumptions) Assume gas particles exert no forces on each other. n Assume the volume of the individual gas particles is negligible (zero). n Identity of the gas doesn’t matter! 5

PV/n. RT vs. P 6

Clicker Question You are standing in a line with 9 other friends, evenly spaced apart. You are at one end of the line (we will call you person #1). You release laughing gas (N 2 O) at the exact same time the person at the other end of the line (person #10) releases the tear gas commonly referred to as CS gas (C 10 H 5 Cl. N 2). Assuming ideal behavior, which person is the first person to simultaneously laugh and cry? a) Person 3 b) Person 4 c) Person 5 d) Person 6 e) Person 7 7

Diffusion of NH 3(g) and HCl(g) 8

Effusion 9

Egg in a Bottle n Using liquid nitrogen to cool the bottle. n n What factors are changing? What factors are staying constant? 10

Egg in a Bottle n Placing a burning cotton ball in the bottle. n n What factors are changing? What factors are staying constant? 11