Tuesday, April 1, 2008
Tues-Day 2
Bio- HW- the outline of text Section 10.2 is due on Thursday.
we illustrated how to draw out a pedigree chart; pedigree charts are useful for tracking and/or inferring the genotypes that exist in members of a family tree. The charts are also used to predict the probability that a given offspring will inherit a given trait from her/his parents based on the parents' and grandparents' phenotypes.
Be careful, some of these charts show the genotype of the family members but others merely show the phenotypes from which the genotypes must be inferred. It may take some trial and error to deduce/infer the genotypes of the family tree members!
Chem 7/8- we discussed the brute force memorize-able fact that ONLY TEMPERATURE can affect the value of Keq. NO OTHER FACTOR, no matter how extreme the equilibrium shift, can ever in the slightest way cause a change in the value of Keq.
For endothermic reactions/processes, increasing Temp. will cause an increase in the value of K (more products) and for exothermic reactions/processes, increasing Temp. will cause a DECREASE in the value of Keq (more REACTANTS).
We then did several "higher-level" Le Chat problems in which you had to figure out a stress that would cause a particular shift.
We saw two demonstrations of equilibrium systems:
1. the chromate-dichromate equilibrium
we showed that increasing the concentration of a product (acid) caused a shift (as seen by the color change) towards the reactants
2. the nitrogen dioxide - dinitrogen tetroxide equilibrium - from the shift as a result of temperature change, we were able to determine that the forward reaction 2 NO2 --> N2O4 was exothermic.
Chem 9-we discussed the brute force memorize-able fact that ONLY TEMPERATURE can affect the value of Keq. NO OTHER FACTOR, no matter how extreme the equilibrium shift, can ever in the slightest way cause a change in the value of Keq.
For endothermic reactions/processes, increasing Temp. will cause an increase in the value of K (more products) and for exothermic reactions/processes, increasing Temp. will cause a DECREASE in the value of Keq (more REACTANTS).
We then did several "higher-level" Le Chat problems in which you had to figure out a stress that would cause a particular shift.
Check out this link from yesterday's demo: the chromate-dichromate equilibrium
we illustrated how to draw out a pedigree chart; pedigree charts are useful for tracking and/or inferring the genotypes that exist in members of a family tree. The charts are also used to predict the probability that a given offspring will inherit a given trait from her/his parents based on the parents' and grandparents' phenotypes.
Be careful, some of these charts show the genotype of the family members but others merely show the phenotypes from which the genotypes must be inferred. It may take some trial and error to deduce/infer the genotypes of the family tree members!
Chem 7/8- we discussed the brute force memorize-able fact that ONLY TEMPERATURE can affect the value of Keq. NO OTHER FACTOR, no matter how extreme the equilibrium shift, can ever in the slightest way cause a change in the value of Keq.
For endothermic reactions/processes, increasing Temp. will cause an increase in the value of K (more products) and for exothermic reactions/processes, increasing Temp. will cause a DECREASE in the value of Keq (more REACTANTS).
We then did several "higher-level" Le Chat problems in which you had to figure out a stress that would cause a particular shift.
We saw two demonstrations of equilibrium systems:
1. the chromate-dichromate equilibrium
we showed that increasing the concentration of a product (acid) caused a shift (as seen by the color change) towards the reactants
2. the nitrogen dioxide - dinitrogen tetroxide equilibrium - from the shift as a result of temperature change, we were able to determine that the forward reaction 2 NO2 --> N2O4 was exothermic.
Chem 9-we discussed the brute force memorize-able fact that ONLY TEMPERATURE can affect the value of Keq. NO OTHER FACTOR, no matter how extreme the equilibrium shift, can ever in the slightest way cause a change in the value of Keq.
For endothermic reactions/processes, increasing Temp. will cause an increase in the value of K (more products) and for exothermic reactions/processes, increasing Temp. will cause a DECREASE in the value of Keq (more REACTANTS).
We then did several "higher-level" Le Chat problems in which you had to figure out a stress that would cause a particular shift.
Check out this link from yesterday's demo: the chromate-dichromate equilibrium
# posted by C @ 3:44 PM 
