Tuesday, October 25, 2011
Tues-Day 1
AP Chem - we dissected the equation relating average speed of a molecule in a sample to the absolute temperature of that sample. We showed how the formula in the reference table is wrong, given the conventional units that we always use; we derived the workaround for that after showing that the Joule is actually a kg m^2 s^-2, so we just change the kg to 1000 x g, which is true by definition.
We then discussed the reasoning behind the Van der Waal's Gas Equation, which puts in two "correction terms", one to correct the decreased pressure due to "a" - intermolecular attractions, and the other to correct for the increased volume due to "b" - how big the actual molecule volumes are.
We discussed the reasons for the relative values of "a" and "b" for a given molecule or series of molecules.
We looked at (again) how to write a sufficient, organized, and logical explanation of a gas law, always relating the variable to the ONLY two factors that cause gas pressure.
Bio - we reviewed the reason that cells must divide, and added a second reason based on the constant quantity of DNA/chromosomes in the nucleus that must code for an increasing quantity of protein as the cell grows.
We looked at the DNA double-helix structure, and saw how DNA could perfectly replicate itself due to its chemical attraction for complementary base pairs, after the DNA double helix unzips (see animation on Edline).
We discussed the parts of INTERPHASE, the main part of a cell's life cycle, G1 (growth of the cell and its components), S (DNA synthesis), and G2 (further cell growth before the mitosis signal is triggered chemically).
We then discussed the reasoning behind the Van der Waal's Gas Equation, which puts in two "correction terms", one to correct the decreased pressure due to "a" - intermolecular attractions, and the other to correct for the increased volume due to "b" - how big the actual molecule volumes are.
We discussed the reasons for the relative values of "a" and "b" for a given molecule or series of molecules.
We looked at (again) how to write a sufficient, organized, and logical explanation of a gas law, always relating the variable to the ONLY two factors that cause gas pressure.
Bio - we reviewed the reason that cells must divide, and added a second reason based on the constant quantity of DNA/chromosomes in the nucleus that must code for an increasing quantity of protein as the cell grows.
We looked at the DNA double-helix structure, and saw how DNA could perfectly replicate itself due to its chemical attraction for complementary base pairs, after the DNA double helix unzips (see animation on Edline).
We discussed the parts of INTERPHASE, the main part of a cell's life cycle, G1 (growth of the cell and its components), S (DNA synthesis), and G2 (further cell growth before the mitosis signal is triggered chemically).
# posted by C @ 6:53 PM 
