Memorandum

To:       CHM 1045 Recitation Instructors
          Dillhyon, Martin, Callihan, Guile

From:     Robley Light

Date:     April 1, 1996

Re:       Recitation 12, week of April 1


Return quizzes and go over them.

You may want to review a couple more examples of figuring out
electron pair geometry, molecular geometry, hybridization, and
polarity.

The quiz Friday will just involve gas law problems.  (Review
Boyle's Law, Charles' Law, Avogadro's Law, the ideal gas law, and
Dalton's Law of Partial Pressures).  

Go over both "one-state" problems (calculating one of the four
variables P, V, n, or T from the other three) and "two-state"
problems, (calculating change in one variable as another is
changed).

Show how Dalton's Law of Partial Pressures is used to correct the
volume of gases which are collected over water (by subtracting the
vapor pressure of water from the total pressure to get the gas
pressure).

Also, we can now use the volume of a gas at a certain temperature
and pressure as a quantity in a stoichiometric calculation (for
example, what volume of hydrogen would be produced from reaction of
25.2 g of potassium with water?).  

I probably won't get to kinetic-molecular theory, effusion and
diffusion, and deviations from ideality for the quiz this week, but
they will be on the exam next week.