Thursday, October 27, 2011
Thurs-Day 1
AP Chem - we finished the marathon gas unit questions; two things to especially watch out for:
1.be sure to draw out what is occuring in solution so that you can SEE the aqueous ions remaining in solution (in your "after" picture) so that you can correctly calculate the concentrations of those remaining ions in the new/final solution volume. If the ion is a "spectator"/not in the net ionic equation, then you MUST use the INITIAL number of moles of that ion in solution to calculate its concentration in one step. MOST of you did not practice that before the last test even though it was done in class and in many practice problems.
2. you MUST show all unit cancellation in the average molecular speed calculation; you saw that in the reference table formula , the 8.31 Joules per mole Kelvin value of R must be broken down to its fundamental components of kilogram meters squared per second squared, and even then the "k" in kilograms must be replace by "x 1000", in order for the units to properly cancel, which must be shown, otherwise credit will not be given.
A list of possible question types will be posted for Monday's exam.
Bio - we went through, step by step, the phases of mitosis, drawing out and noting the significant events of each phase. We showed the net outcome of mitosis with cytokinesis, the production of daughter cells, smaller than the original cell, but containing the SAME number and types of chromosomes.
1.be sure to draw out what is occuring in solution so that you can SEE the aqueous ions remaining in solution (in your "after" picture) so that you can correctly calculate the concentrations of those remaining ions in the new/final solution volume. If the ion is a "spectator"/not in the net ionic equation, then you MUST use the INITIAL number of moles of that ion in solution to calculate its concentration in one step. MOST of you did not practice that before the last test even though it was done in class and in many practice problems.
2. you MUST show all unit cancellation in the average molecular speed calculation; you saw that in the reference table formula , the 8.31 Joules per mole Kelvin value of R must be broken down to its fundamental components of kilogram meters squared per second squared, and even then the "k" in kilograms must be replace by "x 1000", in order for the units to properly cancel, which must be shown, otherwise credit will not be given.
A list of possible question types will be posted for Monday's exam.
Bio - we went through, step by step, the phases of mitosis, drawing out and noting the significant events of each phase. We showed the net outcome of mitosis with cytokinesis, the production of daughter cells, smaller than the original cell, but containing the SAME number and types of chromosomes.
# posted by C @ 11:59 PM 
