Wednesday, October 27, 2010
Wednes-Day 2
Physics - we reviewed some of the Dynamics 2 questions.
We introduced frictional force by defining it and then discussing its CAUSE.
We then showed that its magnitude is determined by a COEFFICIENT of friction times the NORMAL/PERPENDICULAR force to the surface that the object is on.
We will apply this concept, which constantly occurs in daily life (you couldn't WALK without a frictional force propelling you forward!).
We introduced frictional force by defining it and then discussing its CAUSE.
We then showed that its magnitude is determined by a COEFFICIENT of friction times the NORMAL/PERPENDICULAR force to the surface that the object is on.
We will apply this concept, which constantly occurs in daily life (you couldn't WALK without a frictional force propelling you forward!).
AP Chem - we finished the Charles's Law explanation (see updated explanation on Blackboard).
We then began our Quantum Atom unit by discussing the properties of waves, specifically EMR waves.
The Gas Unit exam is on Friday.
Expect questions on the following:
1. Gas stoichiometry with emphasis on applying the gas laws to determine moles and masses of reactants and products. There will be a repeat of the question part involving the determination of all aqueous ion concentrations after a reaction has gone to completion.
GETTING THE CORRECT BALANCED EQUATION MAY REQUIRE THAT YOU BALANCE THE EQUATION VIA THE REDOX HALF-REACTION METHOD IN EITHER BASE OR ACID SO MAKE SURE THAT YOU REVIEW THAT METHOD. MOST OF YOU DID WELL WITH THAT ON THE SOLUTION STOICHIOMETRY TEST.
2. Descriptive chemistry of the four "gas-forming reactions".
3. Explanation, in terms of (a) molecular collision frequency and (b) molecular collision force/kinetic energy, of any permutation of the ideal gas law.
4. Graham's Law of Effusion in terms of relative rates OR times for different gases.
5. Average (rms) speed of a gaseous molecule of a substance at a given temperature.
6. Dalton's Law questions involving partial pressure, mole fraction, and total pressure. Among other things, this applies to reactions in which a gas is collected over water.
7. Van der Waal's gas equation and the explanation of the magnitude of the "a" and "b" correction factors of a given substance.
8. the postulates of kinetic-molecular theory relating to the how and why a real gas will behave ideally or will deviate from ideal behavior.
# posted by C @ 2:40 PM 
