Monday, May 07, 2007
Mon-Day 1
AP: we did another part II exam today; note that, in the weak acid or weak base question, the AP writers can use a VARIETY of unknowns! They will give you the Ka, Kb, [H+], [OH-], percent ionization, or some combination of those quantities and ask you for some quantity that can be calculated from those values. BE FLEXIBLE and prepare yourself for any permutation of these quantities by sticking to the ICE table format to SEE what is occurring in the reaction and using a SRFC table for any kind of titration or precipitation with volume change. Note the not-so-nice numbers in the kinetics table; since you must PROVE your answer: dividing the rate law from one experiment by the rate law from another experiment, the numbers will get lead you to the correct exponents. Be sure to know how to use logarithms in order to solve for the exponent and then plug in your final answer. Make sure that your answer makes sense qualitatively by looking at the collected data. BE SURE to know the RELATIVE rates of appearance and disappearance from the balanced equation (even though the balanced equation CANNOT EVER be used to get the (experimentally determined) RATE LAW.
I hope that you saw that today's "lab" question merely involved knowing the solubility rules!!! The qualitative analysis questions are just questions regarding those rules and your knowledge of question 4/descriptive chem!
Tomorrow, we will do our penultimate part I section! I will save the last part I for next weekend's (optional attendance) AP exam.
Honors: we wrapped the acid/base/salt unit by discussing salts that yield acidic, basic, or neutral solutions. We focused on salts of weak acids and weak bases and saw that the Ka and Kb values are the determining factors of whether the solution is SLIGHTLY acidic or basic.
We then began our redox unit with some definitions, mnemonics, and examples. We will go through these rules on Wednesday and we should be mostly done with most of the unit by Friday.
Our test tomorrow covers the entire acid/base/salt unit as well as the delta G/delta H/ delta S and Keq part of the equilibrium unit. Depending on the length of the test, I may save a couple of questions for the first ten minutes of class on Wednesday so that the test will be given in two parts and will be worth more than 100 points.
Regents: we reviewed a little bit for tomorrow's test. Make sure that you go over each problem type that we covered in class; do EVERY assigned hw problem and check your answers. Our test tomorrow covers the entire acid/base/salt unit.
I hope that you saw that today's "lab" question merely involved knowing the solubility rules!!! The qualitative analysis questions are just questions regarding those rules and your knowledge of question 4/descriptive chem!
Tomorrow, we will do our penultimate part I section! I will save the last part I for next weekend's (optional attendance) AP exam.
Honors: we wrapped the acid/base/salt unit by discussing salts that yield acidic, basic, or neutral solutions. We focused on salts of weak acids and weak bases and saw that the Ka and Kb values are the determining factors of whether the solution is SLIGHTLY acidic or basic.
We then began our redox unit with some definitions, mnemonics, and examples. We will go through these rules on Wednesday and we should be mostly done with most of the unit by Friday.
Our test tomorrow covers the entire acid/base/salt unit as well as the delta G/delta H/ delta S and Keq part of the equilibrium unit. Depending on the length of the test, I may save a couple of questions for the first ten minutes of class on Wednesday so that the test will be given in two parts and will be worth more than 100 points.
Regents: we reviewed a little bit for tomorrow's test. Make sure that you go over each problem type that we covered in class; do EVERY assigned hw problem and check your answers. Our test tomorrow covers the entire acid/base/salt unit.
# posted by C @ 2:10 PM 
