Tuesday, December 7, 2010
Tues-Day 2
Physics - we showed the three ways that work done on an object can change its energy: potential ( work to change height), kinetic (work applied horizontally), and internal (work due to friction).
We did a work problem involving a frictionless ramp.
We also applied the definition of power, the rate at which work is done, to several problems involving work and time.
AP Chem - we reviewed the various types of intermolecular attractions, showing the requirement for extreme dipole dipole attractions (the inappropriately named "hydrogen bonding", in which there is no bond) is an extremely polar region of the molecule due to a highly polar covalent bond within each molecule between an H atom and either an F,O,or N atom (not Cl because that is a larger atom, so the resulting molecules do not pack close enough together for an extreme attraction).
We then discussed the made up "formal (fake, not real) charge" method with which the more/most significant resonance structure in a series of resonance structures may be determined. I teach this only because the method is on the AP exam- its worth may do more harm than good, but we have to know how to use it.
We did a work problem involving a frictionless ramp.
We also applied the definition of power, the rate at which work is done, to several problems involving work and time.
AP Chem - we reviewed the various types of intermolecular attractions, showing the requirement for extreme dipole dipole attractions (the inappropriately named "hydrogen bonding", in which there is no bond) is an extremely polar region of the molecule due to a highly polar covalent bond within each molecule between an H atom and either an F,O,or N atom (not Cl because that is a larger atom, so the resulting molecules do not pack close enough together for an extreme attraction).
We then discussed the made up "formal (fake, not real) charge" method with which the more/most significant resonance structure in a series of resonance structures may be determined. I teach this only because the method is on the AP exam- its worth may do more harm than good, but we have to know how to use it.
# posted by C @ 12:40 PM 
