test link

acidic basic salt ws

Refining

Explain metal refining of impure ores (anodes) with pure metals (cathodes). Also the galvanization process.....

In General

Explain how general criticism always has some flaws due to exceptions to the rule. Then , explain how a test that covers a lot has to be harder so that no jokers can skate through on the last night.
Also, Chem is harder than other subjects due to more memorization ANd conceptualization skills required.
Also, my frozen computer prevented me from uploading objectives on time.

Whither Strong Base

Tell the Honors: Strong Bases: Group I and II Hydroxides ONLY! All else...nah. Oh yeah, all amides too....

Nernst Blown

You blew the Nernst Eq. today. You forgot the RT/nF before the ln Q....tell them tomorrow....It is just -.0592/n lnQ added to Eocell...
no more review in Honors....

K is not Q; and delta Sf is not delta Sabs

Severe retardation regarding non-equilibrium conditions. They still don't know to use the RTlnQ equation when things are not at equilibrium MEANING at initial conditions.

Also, though delta Gf and delta Hf can be used in delta Grxn and delra Hrxm, delta Sf CANNOT. You can ONLY use absolute entropies in Hess's Law.

Clear Ice

Try to relate Chem to real life more often: reas those books, tell them how to make clear vs. cloudy ice cubes. Link to the superatom article.

G.K. LeChat

I have a question about problem number 54 on the 1999 AP exam.
The question states:
2NO(g) + O2(g) <=> 2NO2(g) delta H < 0 Which of the following changes alone would cause a decrease in the value of Keq for the reaction represented above?
a) decreasing the temperature
b) increasing the temperature
c) decreasing the volume of the reaction vessel
d) increasing the volume of the reaction vessel
e) adding a catalyst
The answer is (b). We call K the equilibrium constant for a reason. Changes in concentration or pressure will not change the value of K. Only temperature changes will cause K to change. You can look at K as the ratio of the forward and reverse rate constants. As temperature changes, the rates will change and the rate constants will change, giving a new value of K.
SHOW THEM, mathematically, how a SHIFT doesn't necessarily change K !

Periodic Tables

For the 3rd Quarter Comp test, ask everyone if he has a Periodic Table and to bring it to the test.
Based on the mult. choice questions:
go over "supercooled liquids" = amorphous solids = glass
reactions that go to completion: form gases and/or precipitates
network solids
avg. KE = Temperature

K vs. T and Qualitative Practice

Show the charges how to qualitatively predict how delta H will change with T. That is, if the reaction is endothermic, then K will increase with increasing T and the opposite trend for exo reactions.
Also, show that van't Hoff equation works for BOTH rate constants and equilibrium constants!

Table Gizzle

Make sure to work Table G calculations into your Equilibrium Unit. Copy an old Regents Review book section on that and make a pdf ditto. Do heat of formation and free energy of formation calculations.
Do a review of Periodic Reference Table tips on Naming, Ionic charges, etc.