Thursday, December 9, 2010
Thurs-Day 2
Physics - start prepping for next week's work and energy unit exam - you have a three day weekend!
For hw: check Blackboard for solutions to Work and Energy 1- 4 problems that we did not get to in class. Do those problems from the packet and check your answers.
Today, we discussed all of the formulas for the unit, especially the all-encompassing change in total energy formula. Since energy cannot be created or destroyed, it can only convert from one form another, the total energy change in any object is always ZERO, which equals the sum of the changes in POTENTIAL, KINETIC, and INTERNAL energy.
We have the three formulas for potential, kinetic, and internal (due to frictional work) energy change, so we just let the questions tell us the one missing variable!
We will do problems on "estimates" of physical quantities, and some multiple choice practice on Monday.
AP Chem - notes and hw are now posted on Blackboard (12/10).
we finished our discussion of the "smog" phenomenon by discussing kinetics, energy changes (thermodynamics), and observations of sky color to explain the greater smog content on warm summer days as opposed to cool winter days in NYC.
We went over other octet exception molecules : those containing H, Be, and B, which follow a duet, quartet, and sextet rule, respectively.
We then explained the insufficiency and inaccuracy of using atomic orbitals to explain the bonding in molecules. We use "valence bond theory", which involves VSEPR that causes orbital hybridization.
We went through the hybridization required for each of the possible electron domain numbers about a central atom.
We then began our chart of each of the possible electron domain molecules, starting with an AX2 example.
For hw: check Blackboard for solutions to Work and Energy 1- 4 problems that we did not get to in class. Do those problems from the packet and check your answers.
Today, we discussed all of the formulas for the unit, especially the all-encompassing change in total energy formula. Since energy cannot be created or destroyed, it can only convert from one form another, the total energy change in any object is always ZERO, which equals the sum of the changes in POTENTIAL, KINETIC, and INTERNAL energy.
We have the three formulas for potential, kinetic, and internal (due to frictional work) energy change, so we just let the questions tell us the one missing variable!
We will do problems on "estimates" of physical quantities, and some multiple choice practice on Monday.
AP Chem - notes and hw are now posted on Blackboard (12/10).
we finished our discussion of the "smog" phenomenon by discussing kinetics, energy changes (thermodynamics), and observations of sky color to explain the greater smog content on warm summer days as opposed to cool winter days in NYC.
We went over other octet exception molecules : those containing H, Be, and B, which follow a duet, quartet, and sextet rule, respectively.
We then explained the insufficiency and inaccuracy of using atomic orbitals to explain the bonding in molecules. We use "valence bond theory", which involves VSEPR that causes orbital hybridization.
We went through the hybridization required for each of the possible electron domain numbers about a central atom.
We then began our chart of each of the possible electron domain molecules, starting with an AX2 example.
# posted by C @ 1:08 PM 
