Tuesday, January 27, 2009
Tues-Day 1
AP Chem- we finished our transition metal-ligand complex lab by discussing the bonding within :coordinate covalent bonds between the ligand with the available lone pair and the metal cation with the empty hybridized orbitals. We also accounted for the solubility of these transition metal ion complexes due to their overall low charge density allowing for multiple ion-dipole attractions to overcome the ionic bonding of the lattice.
We returned to Kinetics by showing how to write an EXPECTED rate law from a PROPOSED elementary step of a mechanism; you simply write "rate" = k times the concentration of each REACTANT (not product) to an EXPONENT (equal to the NUMBER of atoms/molecules/ions of that substance in your elementary step).
The rate law for the SLOW step of your mechanism, the step with the HIGHEST activation energy, the step that DETERMINES the overall rate of the reaction (as we showed by analogy in class) should agree with/equal/match the EXPERIMENTALLY DETERMINED rate law. If your slow step rate law does not match the experimental rate law, the mechanism is wrong with ONE EXCEPTION that we will discuss tomorrow. We will also discuss HOW to mathematically obtain a rate law from EXPERIMENTAL DATA (fun with exponents).
Bio 6/7- we reviewed the parts of the blood and then we saw videos (available on Blackboard!) on the respiratory system and on the mechanics of breathing; we then discussed the mechanism by which the medulla oblongata detects the elevated carbon dioxide level in the blood and sends a neurochemical signal to the diaphragm, causing the diaphragm to contract, which expands the chest cavity, which lowers the air pressure in the lungs, causing the higher pressure air outside of the body to rush into the lungs i.e. inspiration. The diaphragm then relaxes/pushes up on the lungs, increasing the air pressure in the lungs, which forces the air out of the lungs causing exhalation, which rids the blood of excess carbon dioxide. The cycle then begins again as body cells, which are constantly producing carbon dioxide via aerobic respiration, have their carbon dioxide diffuse into the blood.
We then started to compile the resting and post-exercise pulse rate data from our last lab.
Bio 8- we reviewed the parts of the blood and then we saw videos (available on Blackboard!) on the respiratory system and on the mechanics of breathing; we then discussed the mechanism by which the medulla oblongata detects the elevated carbon dioxide level in the blood and sends a neurochemical signal to the diaphragm, causing the diaphragm to contract, which expands the chest cavity, which lowers the air pressure in the lungs, causing the higher pressure air outside of the body to rush into the lungs i.e. inspiration. The diaphragm then relaxes/pushes up on the lungs, increasing the air pressure in the lungs, which forces the air out of the lungs causing exhalation, which rids the blood of excess carbon dioxide. The cycle then begins again as body cells, which are constantly producing carbon dioxide via aerobic respiration, have their carbon dioxide diffuse into the blood.
We returned to Kinetics by showing how to write an EXPECTED rate law from a PROPOSED elementary step of a mechanism; you simply write "rate" = k times the concentration of each REACTANT (not product) to an EXPONENT (equal to the NUMBER of atoms/molecules/ions of that substance in your elementary step).
The rate law for the SLOW step of your mechanism, the step with the HIGHEST activation energy, the step that DETERMINES the overall rate of the reaction (as we showed by analogy in class) should agree with/equal/match the EXPERIMENTALLY DETERMINED rate law. If your slow step rate law does not match the experimental rate law, the mechanism is wrong with ONE EXCEPTION that we will discuss tomorrow. We will also discuss HOW to mathematically obtain a rate law from EXPERIMENTAL DATA (fun with exponents).
Bio 6/7- we reviewed the parts of the blood and then we saw videos (available on Blackboard!) on the respiratory system and on the mechanics of breathing; we then discussed the mechanism by which the medulla oblongata detects the elevated carbon dioxide level in the blood and sends a neurochemical signal to the diaphragm, causing the diaphragm to contract, which expands the chest cavity, which lowers the air pressure in the lungs, causing the higher pressure air outside of the body to rush into the lungs i.e. inspiration. The diaphragm then relaxes/pushes up on the lungs, increasing the air pressure in the lungs, which forces the air out of the lungs causing exhalation, which rids the blood of excess carbon dioxide. The cycle then begins again as body cells, which are constantly producing carbon dioxide via aerobic respiration, have their carbon dioxide diffuse into the blood.
We then started to compile the resting and post-exercise pulse rate data from our last lab.
Bio 8- we reviewed the parts of the blood and then we saw videos (available on Blackboard!) on the respiratory system and on the mechanics of breathing; we then discussed the mechanism by which the medulla oblongata detects the elevated carbon dioxide level in the blood and sends a neurochemical signal to the diaphragm, causing the diaphragm to contract, which expands the chest cavity, which lowers the air pressure in the lungs, causing the higher pressure air outside of the body to rush into the lungs i.e. inspiration. The diaphragm then relaxes/pushes up on the lungs, increasing the air pressure in the lungs, which forces the air out of the lungs causing exhalation, which rids the blood of excess carbon dioxide. The cycle then begins again as body cells, which are constantly producing carbon dioxide via aerobic respiration, have their carbon dioxide diffuse into the blood.
# posted by C @ 11:59 AM 
