Almost exam time...

Today in class we talked about naming organic compounds using roots and suffixes. The classes of organic compounds we covered were: alkanes, alkenes, alkynes, alcohols, amines, and acids. {Hmm, they all start with "a"...} There's a table in the book that lists others, but I think the "a" team is enough for us at this point.

We also looked at the difference between empirical formulas and molecular formulas. Molecular formulas are always multiples of empirical formulas (even if you're multiplying by "1" in some cases).

A few people have contacted me about the lab quiz on D2L. You will only have a D2L lab quiz if you are in my lab classes; I don't believe Dr. Marasinghe is using D2L lab quizzes. Labs will meet in the same rooms as last week to get started (BR263 for my 9am Thursday lab, SL118 for all others.

We also worked on a problem set in class, I've copied it below.

Chem 150 – Fall 2008 – Problem Set #1
1. You have found a bottle in your lab that is labeled “cobalt sulfite”, but the charge of the cobalt is not listed. After analysis, you find that the contents have the following composition: % Co = 32.91; % S = 26.86. What is the correct formula of this compound and what is the charge of the cobalt?
2. You have received a sample of an iron-nickel alloy (a mixture of metals) that contains exactly 1.00mol of metal atoms. This sample has a mass of 56.267g. What is the percent iron in this sample? {Hint: This is a weighted average problem, just like isotopic abundance, but it’s using 2 different elements instead of 2 different isotopes.}

OK, this post is getting kind of long. You have a new MC assignment posted, due Sunday.