Friday, March 13, 2009
Fri-Day 1
AP Chem- DUE TUESDAY (same day as the quick descriptive chem quiz!), do the following 8 text questions for hw:
Chapter 14, pages 715-716: #100 and #126
Chapter 15, pages 782-787: #24, 39, 56, 60, 70 , 116
Also, on Blackboard, check the answers to today's descriptive chem quiz.
We drew out the various titration curves that result from titrations of acids with bases and vice versa. We emphasized certain "tells" or "dead giveaways" that the acid or base that is titrated is strong or weak (i.e. initial pH from the given concentration or INITIAL sharp change(or lack thereof) in pH.
We also saw that, for weak acids or weak bases, we could SEE the pKa or pKb value (respectively) by looking at the center of the "buffer region"/flat part of the titration curve and locating the pH on the y-axis at that point of inflection.
We then began a LONG full, quantitative titration problem involving a weak acid and a strong base/titrant. The FOUR main points of interest, typically, are:
1. initial pH
2. pH at halfway to the equivalence point = pKa !!!
3. pH AT the equivalence point (MUST DO SRFC AND THEN ICE!!!)
4. pH past the equivalence point (or the limiting final pH).
Bio 6/7- we discussed the evolutionary advantages and disadvantages of sexual reproduction and then we saw a video that detailed the phases of meiosis I and meiosis II (I will post that video on Blackboard for your viewing pleasure/review.)
We then drew out a detailed step-by-step picture showing the source of variety/genetic recombination/"genetic mixing" that occurs during PROPHASE I and METAPHASE I of meiosis.
We will continue this on Monday but, in order to save time, I will give you the template for the rest of the phases.
Bio 8- we discussed the evolutionary advantages and disadvantages of sexual reproduction and then we saw a video that detailed the phases of meiosis I; we will continue with that video on Monday but I will post it on Blackboard for your viewing pleasure.
Chapter 14, pages 715-716: #100 and #126
Chapter 15, pages 782-787: #24, 39, 56, 60, 70 , 116
Also, on Blackboard, check the answers to today's descriptive chem quiz.
We drew out the various titration curves that result from titrations of acids with bases and vice versa. We emphasized certain "tells" or "dead giveaways" that the acid or base that is titrated is strong or weak (i.e. initial pH from the given concentration or INITIAL sharp change(or lack thereof) in pH.
We also saw that, for weak acids or weak bases, we could SEE the pKa or pKb value (respectively) by looking at the center of the "buffer region"/flat part of the titration curve and locating the pH on the y-axis at that point of inflection.
We then began a LONG full, quantitative titration problem involving a weak acid and a strong base/titrant. The FOUR main points of interest, typically, are:
1. initial pH
2. pH at halfway to the equivalence point = pKa !!!
3. pH AT the equivalence point (MUST DO SRFC AND THEN ICE!!!)
4. pH past the equivalence point (or the limiting final pH).
Bio 6/7- we discussed the evolutionary advantages and disadvantages of sexual reproduction and then we saw a video that detailed the phases of meiosis I and meiosis II (I will post that video on Blackboard for your viewing pleasure/review.)
We then drew out a detailed step-by-step picture showing the source of variety/genetic recombination/"genetic mixing" that occurs during PROPHASE I and METAPHASE I of meiosis.
We will continue this on Monday but, in order to save time, I will give you the template for the rest of the phases.
Bio 8- we discussed the evolutionary advantages and disadvantages of sexual reproduction and then we saw a video that detailed the phases of meiosis I; we will continue with that video on Monday but I will post it on Blackboard for your viewing pleasure.
# posted by C @ 12:10 PM 
