Thursday, September 22, 2011

 

Thurs-Day 1

AP Chem- we did a qualitative analysis of four unlabeled salt solutions; using our knowledge of solubility rules and precipitation reactions, we can deduce the identity of each unlabeled solution, given a list of four possible salts.
There was a contamination from iron III ions in the tap-water used to make the solutions, a good lesson on the general requirement of using distilled, deionized water for making solutions!
We will continue this analysis on Monday.
We finished our discussion of gravimetric analysis of an unknown element or polyatomic ion; we then did a combustion analysis problem - this type of analysis is more commonly and practically performed on compounds due to the relative ease of burning substances with oxygen.

Bio - we continued our discussion of the structures and some functions of carbohydrates and lipids; we then showed an incredibly diverse and functionally important biological class of molecule: proteins.
For each major class of molecule, we showed the simple building blocks, and the complete complex molecule formed via dehydration synthesis. These complex molecules can be broken down/digested/hydrolyzed via hydrolysis.
In 10/11, we did a carbohydrate, protein, and lipid model lab.



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