Wednesday, November 17, 2010
Wednes-Day 1
Physics - we finished an impulse problem in which we needed the frictional force in order to calculate the applied force. We used mu times the normal force to get the frictional force. We realized from our drawing that the frictional force is directed opposite to the applied force, and therefore MUST have the opposite/negative sign.
We then learned the Law of Momentum Conservation: p before = p after has always been observed for all physical phenomena! ALWAYS draw a picture and CAREFULLY make sure that the SIGN of the number is consistent with the DIRECTION of the velocity/momentum!
We applied this equation to three scenarios:
1. Explosions 0.00 (kg m s^-1) = m1v1 + m2v2
2. Bouncy/Elastic Collisions between two objects: m1v1(initial) + m2 v2(initial) = m1v1(final) + m2v2(final)
3. Sticky/Inelastic Collisions between two objects: m1v1(initial) + m2 v2(initial) = (m1 + m2) v(final)
We applied these detailed formulas to three problems, one of each type.
Do problems #2 and #4 in the Momentum 2 packet, and check your answers on Blackboard later!
AP Chem -Tomorrow we have the unit exam on the Quantum Atom:
There will be a set of multiple choice questions on quantum numbers, and the various rules of electron energy order and proper configuration in a ground state atom or ion.
The other questions cover the entire unit notes:
EMR phenomena, Planck, Einstein's explanation of the photoelectric effect
Calculation of bond energies using photons to break the bonds.
the Bohr Model - both quantitative and qualitative (explanation of emission spectra)
the Quantum Mechanical Model of the Atom:
the Aufbau Principle, the Pauli Exclusion Principle, Hund's Rule, energy sublevel ordering,
Quantum numbers: their physical meaning and their quantitative values.
Explanations of the four anomalies to the Aufbau Principle (Cr, Mo, Cu, and Ag) in terms of energy sublevel differences and Coulomb's Law.
This is a tough test for those who did not improve their explanation-writing ability. Since not a SINGLE student has come in to correct their previous explanations, I can only wonder how these explanations are going to be written and critiqued.
Today we continued our explanation of the periodic trend in atomic size across a period in order of increasing atomic number, and also the periodic trend in atomic size down a group.
We then learned the Law of Momentum Conservation: p before = p after has always been observed for all physical phenomena! ALWAYS draw a picture and CAREFULLY make sure that the SIGN of the number is consistent with the DIRECTION of the velocity/momentum!
We applied this equation to three scenarios:
1. Explosions 0.00 (kg m s^-1) = m1v1 + m2v2
2. Bouncy/Elastic Collisions between two objects: m1v1(initial) + m2 v2(initial) = m1v1(final) + m2v2(final)
3. Sticky/Inelastic Collisions between two objects: m1v1(initial) + m2 v2(initial) = (m1 + m2) v(final)
We applied these detailed formulas to three problems, one of each type.
Do problems #2 and #4 in the Momentum 2 packet, and check your answers on Blackboard later!
AP Chem -Tomorrow we have the unit exam on the Quantum Atom:
There will be a set of multiple choice questions on quantum numbers, and the various rules of electron energy order and proper configuration in a ground state atom or ion.
The other questions cover the entire unit notes:
EMR phenomena, Planck, Einstein's explanation of the photoelectric effect
Calculation of bond energies using photons to break the bonds.
the Bohr Model - both quantitative and qualitative (explanation of emission spectra)
the Quantum Mechanical Model of the Atom:
the Aufbau Principle, the Pauli Exclusion Principle, Hund's Rule, energy sublevel ordering,
Quantum numbers: their physical meaning and their quantitative values.
Explanations of the four anomalies to the Aufbau Principle (Cr, Mo, Cu, and Ag) in terms of energy sublevel differences and Coulomb's Law.
This is a tough test for those who did not improve their explanation-writing ability. Since not a SINGLE student has come in to correct their previous explanations, I can only wonder how these explanations are going to be written and critiqued.
Today we continued our explanation of the periodic trend in atomic size across a period in order of increasing atomic number, and also the periodic trend in atomic size down a group.
# posted by C @ 11:29 AM 
