Monday, March 30, 2009
Mon-Day 2
AP Chem- THE test is tomorrow; the one that I have been crowing about all year. Please do as many practice problems as possible so that you do not run out of time or make any of the myriad possible errors (as pointed out in class) on tomorrow's test.
Discussed the 3rd Law of Thermodynamics, which allows us to calculate the ACTUAL absolute entropies of substances because a perfect crystal of a substance at zero Kelvin actually has zero absolute entropy (not an arbitrarily chosen reference value).
We then mimicked J. Willard Gibbs, the grandaddy of Thermo, in the derivation of Gibbs Free Energy from the 2nd Law of Thermo; we distilled that formula into one involving only measurable changes in a system's enthalpy and entropy. We discussed the FOUR permutations of delta H and delta S, showing the conditions that would net a negative delta G (spontaneous reaction or process) or positive delta G (not spontaneous reaction or process).
We discussed the qualitative and quantitative meanings of delta G as well as the definition of STANDARD Gibbs free energy conditions.
We then used that definition to apply the equivalent of Hess's Law to solve for the standard CHANGE in Gibbs Free Energy for a given reaction (see notes for the answer to today's final question).
Bio 6- discussed the notation and deductive reasoning involved in determining GENOTYPES from a series of generations on a PEDIGREE chart.
We saw how to spot a "sex-linked" trait: GIVEN normal PHENOTYPE parents, we notice that ONLY the male offspring have the RECESSIVE allele caused PHENOTYPE show up. This is because the Y chromosome that causes an offspring to be male does not contain the complementary allele found on the X chromosome. So, if the mother passes on a recessive allele on that X chromosome to her son, the son MUST display the phenotype caused by that recessive allele.
Bio 7/8- discussed the notation and deductive reasoning involved in determining GENOTYPES from a series of generations on a PEDIGREE chart.
We saw how to spot a "sex-linked" trait: GIVEN normal PHENOTYPE parents, we notice that ONLY the male offspring have the RECESSIVE allele caused PHENOTYPE show up. This is because the Y chromosome that causes an offspring to be male does not contain the complementary allele found on the X chromosome. So, if the mother passes on a recessive allele on that X chromosome to her son, the son MUST display the phenotype caused by that recessive allele.
We then finished up the dominant/recessive human pedigree lab.
Discussed the 3rd Law of Thermodynamics, which allows us to calculate the ACTUAL absolute entropies of substances because a perfect crystal of a substance at zero Kelvin actually has zero absolute entropy (not an arbitrarily chosen reference value).
We then mimicked J. Willard Gibbs, the grandaddy of Thermo, in the derivation of Gibbs Free Energy from the 2nd Law of Thermo; we distilled that formula into one involving only measurable changes in a system's enthalpy and entropy. We discussed the FOUR permutations of delta H and delta S, showing the conditions that would net a negative delta G (spontaneous reaction or process) or positive delta G (not spontaneous reaction or process).
We discussed the qualitative and quantitative meanings of delta G as well as the definition of STANDARD Gibbs free energy conditions.
We then used that definition to apply the equivalent of Hess's Law to solve for the standard CHANGE in Gibbs Free Energy for a given reaction (see notes for the answer to today's final question).
Bio 6- discussed the notation and deductive reasoning involved in determining GENOTYPES from a series of generations on a PEDIGREE chart.
We saw how to spot a "sex-linked" trait: GIVEN normal PHENOTYPE parents, we notice that ONLY the male offspring have the RECESSIVE allele caused PHENOTYPE show up. This is because the Y chromosome that causes an offspring to be male does not contain the complementary allele found on the X chromosome. So, if the mother passes on a recessive allele on that X chromosome to her son, the son MUST display the phenotype caused by that recessive allele.
Bio 7/8- discussed the notation and deductive reasoning involved in determining GENOTYPES from a series of generations on a PEDIGREE chart.
We saw how to spot a "sex-linked" trait: GIVEN normal PHENOTYPE parents, we notice that ONLY the male offspring have the RECESSIVE allele caused PHENOTYPE show up. This is because the Y chromosome that causes an offspring to be male does not contain the complementary allele found on the X chromosome. So, if the mother passes on a recessive allele on that X chromosome to her son, the son MUST display the phenotype caused by that recessive allele.
We then finished up the dominant/recessive human pedigree lab.
# posted by C @ 3:45 PM 
