Monday, October 24, 2011
Mon-Day 2
AP Chem - we discussed Graham's Law of Effusion/Diffusion, which can be derived simply by considering the formula for average kinetic energy/ temperature as it relates to the average speed of a molecule.
We saw that the more massive molecules must be moving more slowly on average than less massive molecules, at the same temperature; thus more massive molecules must effuse at a slower rate, all other factors being equal.
Bio - began our new unit on DNA Replication, Mitosis, and Cytokinesis.
We discussed the reason/driving force for cell division, without which the cell would no longer be able to sufficiently carry out its metabolic processes.
We saw that, as a cell grows, even though the surface area increase to allow for more essential biochemicals to diffuse into the cell, the volume of the cell increases at an even greater rate so that these randomly moving essential molecules take too long to reach where they need to go to collide/react with other reactant molecules in the cell. Thus, the cell must divide/decrease its volume, or it will die.
We saw that the more massive molecules must be moving more slowly on average than less massive molecules, at the same temperature; thus more massive molecules must effuse at a slower rate, all other factors being equal.
Bio - began our new unit on DNA Replication, Mitosis, and Cytokinesis.
We discussed the reason/driving force for cell division, without which the cell would no longer be able to sufficiently carry out its metabolic processes.
We saw that, as a cell grows, even though the surface area increase to allow for more essential biochemicals to diffuse into the cell, the volume of the cell increases at an even greater rate so that these randomly moving essential molecules take too long to reach where they need to go to collide/react with other reactant molecules in the cell. Thus, the cell must divide/decrease its volume, or it will die.
# posted by C @ 11:35 PM 
