Tuesday, November 23, 2010
Tues-Day 1
Happy Thanksgiving to all of you and your families! Physics- did an impulse and an elastic collision momentum problem in the Momentum 4 ditto. We then reviewed the concept of "centripetal force REQUIREMENT", which is equal to the square of an objects velocity divided by the radius of its circular path. The SOURCE or sources of the centripetal force must add up to the centripetal force requirement in order for the object to maintain a circular path/orbit.
We then did several circular motion problems. Most of these problems involve either one or two steps, depending on the given variables.
We then finished (almost) the Hooke's Law spring constant lab in which we determined the direct proportion relationship between the force on a spring and its stretch distance.
The spring constant, k, in Newtons per meter, indicates the elasticity or stiffness of the spring: the greater the k value, the stiffer/less elastic the spring.
AP Chem - we reviewed the sources of the first ionization energy anomalies in groups 13 and 16 ( s-p electron shielding, and intra-orbital electron-electron repulsion, respectively) as explained using the quantum orbital diagrams.
We then showed the source of electronegativity, which is a combination of the Zeff and particular Principal energy level of the shared valence electrons.
We then DEFINED electron affinity, a strictly artificial laboratory measurement that does not naturally occur, in which electrons are directed at gaseous atoms to determine the degree of attraction that an atom of an element has for an incoming electron.
This unit is essentially completed, except for a more detailed discussion of successive ionization energies.
I have posted several practice tests/worksheets in the Periodicity unit files on Blackboard. Make sure that you read the tutorials and Powerpoints, and do as many questions as possible before next week's exam, which will be given on WEDNESDAY or FRIDAY.
The Thanksgiving assignment is posted on Blackboard. You will learn, WITHOUT a reference table (!), the various organic functional groups, names, and formulas. The answers to that part of the assignment have been provided so you do not have to hand in that part.
The descriptive chemistry/ predicting products/ writing balanced equations part of the assignment provides you with a review of the reactions that you should know IMMEDIATELY and intuitively by now. If you do not, you need to practice writing dozens of each reaction type.There are two questions that you may be not as familiar with, though we have seen them in the redox and stoichiometry units; to help you with those questions, use the hints provided on Blackboard.
The test is worth a 50 point homework grade.
You will be quizzed or tested on all parts of this assignment just after your next unit exam.
# posted by C @ 4:44 PM 
