Quiz #2 is now posted up on Mastering Chemistry. For each quiz you are permitted one submission of your answer and you have an unlimited time to complete the quiz. It is due on Sunday, January 16th, at 11:00 pm. There are three versions of the quiz posted (A, B, and C) and your highest grade will be recorded as your Quiz #2 score. Each quiz is 10 questions totaling 10 points.
To this point in lecture we have only discussed pure gases, but in reality gases readily exist as mixtures. Gas Mixtures and Partial Pressures were discussed today starting with Dalton's Law of Partial Pressures. Manipulation of the ideal gas law allows us to use a mole fraction relationship to analyze mixtures of gases. A common experiment of collecting gas over water was described and a calculation was performed showing how the mass of a solid reactant can be calculated from the volume of a gas collected.
I used the gas properties PhET simulation from the Chapter 10 Section 10.1 - 10.4 Ungraded Practice Quiz Problems assignment to illustrate Kinetic Molecular Theory. Be sure to use that tutorial with the statements from the Kinetic Molecular Theory (page 414) to see how these statements come to life.
I was finishing up the chapter with gas speeds, diffusion and effusion when the bell rang. I'll start class on Friday with the following example:
The rate of effusion of an unknown gas is 2.91 times faster than that of NH3. What is the molecular weight of the gas?
If you are keeping up with the material you should be finishing up all of the Chapter 10 problems, which will prepare you for the quiz.
Inspirational Quote of the Day:
"Concern for man and his fate must form the chief interest of all technical endeavors… Never forget that in the midst of your diagrams and equations."
-Albert Einstein
Songs Played Before Class:
Journey - Don't Stop Believing
Counting Crows - Mr. Jones
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