Thursday, January 04, 2007
Thursday, Day 3
AP: we looked at Raoult's Law diagrams that show the composition of the liquid mixture and vapor mixture vs. Temperature. The stomata-shaped region between the two lines are equilibrium combinations of vapor and liquid phases of the mixture, though that region is not used in any calculations from these graphs. On the graph, we then showed the change in composition of the liquid and vapor mixtures per cycle of vaporization and condensation. These cycles occur repeatedly in any distillation apparatus. The simple distillation apparatus that is show in the text is good for just ONE cycle of vaporization and condensation. In real petroleum refineries (as you saw on last year's Regents exam), there are dozens of vaporization and distillation cycles per column so that methane, ethane, propane, octane, vaseline, tar, etc. can be separated efficiently.
We then went through three of the four cases that show ideal or deviant solution behavior (with respect to Raoult's Law).
For case one, a nearly ideal solution forms when the components of the mixture are as attracted to each other as they are to themselves, that is, A<->B = A<-->A = B<-->B. For that case, the delta H of solution is about 0 because there is not net gain or loss in intermolecular attraction as the components are mixed together.
We will review the other cases briefly tomorrow.
Regents: We learned how to name binary and ternary acids; using the worksheets and the links from the class website, practice naming the acids. We will cover naming of bases tomorrow and then we will get into part II of this unit: intermolecular attractions.
Honors: we finished learning how to name acids and then we covered hydroxide bases. Check the website for links and worksheets. We began to describe the nature of metallic bonding, which we will continue tomorrow.
We then went through three of the four cases that show ideal or deviant solution behavior (with respect to Raoult's Law).
For case one, a nearly ideal solution forms when the components of the mixture are as attracted to each other as they are to themselves, that is, A<->B = A<-->A = B<-->B. For that case, the delta H of solution is about 0 because there is not net gain or loss in intermolecular attraction as the components are mixed together.
We will review the other cases briefly tomorrow.
Regents: We learned how to name binary and ternary acids; using the worksheets and the links from the class website, practice naming the acids. We will cover naming of bases tomorrow and then we will get into part II of this unit: intermolecular attractions.
Honors: we finished learning how to name acids and then we covered hydroxide bases. Check the website for links and worksheets. We began to describe the nature of metallic bonding, which we will continue tomorrow.
# posted by C @ 10:16 AM 
