near April

in all classes, revisit the PE diagrams and make sure that they know all 8 or 9 arrows backwards and forwards...do this right after the catalyst factor... and before you move on to Le Chat...

MAJOR ERROR in AP today: you CANNOT get absolute entropy from delta Gf standard and delta Hf standard....you can only get delta Sf which is NOT absolute S of the substance at that temp!!!
Be sure to do that on Monday!

Corrections

math o chem 2: F's due to NOT using balanced chem equation that they JUST balanced!
not writing out general equation, rearranging, and then plugging in!
not knowing when to use the salt solubility chart, not scaling up the grams of salt dissolved!
Math o chem 3: ...NOT even able to simply state the reasons for nonideal behavior.
Totally F-ed graham's law and any algebra in which x is in the denominator, which i told them to avoid anyway!

Regents: do NOT bother them with quantitative and boring kinetics calcs! get right into the factors that affect rates and DO DEMOS.

acid base salt buffer

errors:
almost nobody can do salt hydrolysis to predict the pH of an acidic or basic salt.

Careful with adding acid or base to buffer problems. You get the ratio w H-H equation BUT you MUST scale the ratio to the actual quantities given.

Teach solubilty and end point titrations as a two step:
stoichiometry
to
equilibrium ICE calc.
ALSO!!! DON'T FORGET THE OBSESSION THAT AP HAS WITH SOLUTION EVAPORATION WHILE STAYING SATURATED...show that there is NO change in concentration as evaporation occurs!!!

dnf

teaching saturated and dilute vs. saturated and concentrated and other permutations.

don't forget 10^-8 M HCl question for AP

recent snafus

- no positron slids on the winter break nuclear module; put electron capture also.

- Regents take home test: put up days before vacation so that nobody can cry ignorance of assignment.

- change redundant questions on the test; review entire test before posting! (check old emails).

- H: scrap blackbody explanation from here on in; no time.