Tuesday, March 15, 2011
Tues-Day 1
Physics - we finished the graph in which we calculated/drew the resultant wave from the superposition/interference of two waves.
We then listened to and saw a demo of the Doppler effect that shows how the frequency of a wave produced by a MOVING object will reach the receiver/hearer/viewer of that wave with a DIFFERENT frequency, due to the movement of the object that produces the wave. As the object moves closer to the receiver, the heard frequency/pitch is higher, whereas when the object moves away from the receiver, the frequency experienced by the receiver is lower.
We did a few more questions (5-7) in Waves 4.
On Blackboard, I will post links to the animations from this unit, as well as some helpful site, and all of the packet answers covered so far. Use these to study for Thursday/Friday's test.
SOME things to be sure to go over for tomorrow's exam:
1. pH calculation of a strong MONOPROTIC acid of given/known concentration
2.pH calculation of a strong base (either MONOhydroxy OR DIhydroxy!!!-beware trap!!!-see notes) of given/known concentration
(For 3-6, an organizer/ICE Table is suggested and probably helpful; either way, all work must be shown, step by step).
3. given Ka (OR pKa) AND concentration, determine pH AND percent ionization of a weak acid
4. given (equilibrium) pH AND concentration of a weak acid, determine its Ka OR pKa
5. given Kb (OR pKb) AND concentration, determine pH AND percent ionization of a weak base
6. given (equilibrium) pH AND concentration of a weak base, determine its Kb OR pKb
7. EXPLAIN, in terms of (1) H-X bond strength and (2) H-X bond polarity, the relative strengths of a series of acids.
8. explain, in terms of water hydrolysis by an anion, cation, or both ions, how a given salts forms an acidic, basic, or neutral solution. For solutions in which BOTH ions cause hydrolysis, determine, based upon given pKa, Ka, pKb, or Kb of the ions OR their CONJUGATES, whether the solution will be SLIGHTLY acidic or SLIGHTLY basic.
9. For reactions involving Bronsted acid base conjugate pairs, predict AND explain (based on given Ka, Kb, pKa, or pKb values and their meanings) the favored direction as the reaction proceeds towards equilibrium.
We then listened to and saw a demo of the Doppler effect that shows how the frequency of a wave produced by a MOVING object will reach the receiver/hearer/viewer of that wave with a DIFFERENT frequency, due to the movement of the object that produces the wave. As the object moves closer to the receiver, the heard frequency/pitch is higher, whereas when the object moves away from the receiver, the frequency experienced by the receiver is lower.
We did a few more questions (5-7) in Waves 4.
On Blackboard, I will post links to the animations from this unit, as well as some helpful site, and all of the packet answers covered so far. Use these to study for Thursday/Friday's test.
AP Chem - reviewed buffer solution formation, and did another example. We saw what happened to the ratio of the conjugate acid and base of a buffer as more acid or base is added.
We then quantitatively determined the pH of a buffer solution; we will use a shortcut method under certain STRICT conditions, later this unit.SOME things to be sure to go over for tomorrow's exam:
1. pH calculation of a strong MONOPROTIC acid of given/known concentration
2.pH calculation of a strong base (either MONOhydroxy OR DIhydroxy!!!-beware trap!!!-see notes) of given/known concentration
(For 3-6, an organizer/ICE Table is suggested and probably helpful; either way, all work must be shown, step by step).
3. given Ka (OR pKa) AND concentration, determine pH AND percent ionization of a weak acid
4. given (equilibrium) pH AND concentration of a weak acid, determine its Ka OR pKa
5. given Kb (OR pKb) AND concentration, determine pH AND percent ionization of a weak base
6. given (equilibrium) pH AND concentration of a weak base, determine its Kb OR pKb
7. EXPLAIN, in terms of (1) H-X bond strength and (2) H-X bond polarity, the relative strengths of a series of acids.
8. explain, in terms of water hydrolysis by an anion, cation, or both ions, how a given salts forms an acidic, basic, or neutral solution. For solutions in which BOTH ions cause hydrolysis, determine, based upon given pKa, Ka, pKb, or Kb of the ions OR their CONJUGATES, whether the solution will be SLIGHTLY acidic or SLIGHTLY basic.
9. For reactions involving Bronsted acid base conjugate pairs, predict AND explain (based on given Ka, Kb, pKa, or pKb values and their meanings) the favored direction as the reaction proceeds towards equilibrium.
# posted by C @ 9:24 AM 
