Thursday, September 25, 2008
Thurs-Day 2
AP Chem- we discussed the inability of the Bohr Atomic Model to account for many of the emission lines in all elements except Hydrogen. We then looked at the basis of the Quantum Mechanical Model of the atom, which treat the electron as a particle and a wave and accounts of electron-electron repulsions.
The Schroedinger equation solves for the "allowed" energies of all electrons in an atom.
Each electron's energy and approximate region is described by four quantum numbers: n, l, m(l), and m(s).
We then saw that the principal quantum number limited the angular momentum/azimuthal quantum number to a certain range of values. We also saw that the azimuthal quantum number determines the possible number of orientations that the orbitals can have in space. Magnetic spin number can be only one of two values: + 1/2 and -1/2.
We then applied this new information to earlier orbital language i.e. s, p, d, and f sublevels are associated with the azimuthal quantum numbers 0, 1, 2, and 3, respectively.
Bio 6/7- we continued our discussion of enzymes. We saw that the two main factors that determine that activity/rate of enzyme action are temperature and pH.
The lower the temperature, the slower ALL molecules are moving, thus the slower an enzyme works. As the temperature approaches the OPTIMUM temperature for the given enzyme, the enzyme maintains its shape and it moves faster and collides with more substrate molecules every minute so its rate of catalytic activity increases. HOWEVER, a few degrees or more higher than an enzymes optimum temperature will cause the enzyme to violently collide too fast with other particles and the enzyme will UNRAVEL and thus DENATURE; it loses its shape/active site and thus becomes unable to catalyze any more reactions.
We then saw a demonstration of catalase enzyme, which speeds up the breakdown/lysis of hydrogen peroxide into oxygen gas (bubbles).
We saw that at too high a pH (too basic) or too low a pH (too acidic), catalase did not catalyze the breakdown of hydrogen peroxide because the catalase enzyme had denatured!
Also, as temperature went from cold (10 C) to room temperature (23 C), the catalase enzyme activity increased BUT at a high temperature, the catalase activity dropped due to the UNRAVELING of the enzyme.
Bio 8- we continued our discussion of enzymes. We saw that the two main factors that determine that activity/rate of enzyme action are temperature and pH.
The lower the temperature, the slower ALL molecules are moving, thus the slower an enzyme works. As the temperature approaches the OPTIMUM temperature for the given enzyme, the enzyme maintains its shape and it moves faster and collides with more substrate molecules every minute so its rate of catalytic activity increases. HOWEVER, a few degrees or more higher than an enzymes optimum temperature will cause the enzyme to violently collide too fast with other particles and the enzyme will UNRAVEL and thus DENATURE; it loses its shape/active site and thus becomes unable to catalyze any more reactions.
The Schroedinger equation solves for the "allowed" energies of all electrons in an atom.
Each electron's energy and approximate region is described by four quantum numbers: n, l, m(l), and m(s).
We then saw that the principal quantum number limited the angular momentum/azimuthal quantum number to a certain range of values. We also saw that the azimuthal quantum number determines the possible number of orientations that the orbitals can have in space. Magnetic spin number can be only one of two values: + 1/2 and -1/2.
We then applied this new information to earlier orbital language i.e. s, p, d, and f sublevels are associated with the azimuthal quantum numbers 0, 1, 2, and 3, respectively.
Bio 6/7- we continued our discussion of enzymes. We saw that the two main factors that determine that activity/rate of enzyme action are temperature and pH.
The lower the temperature, the slower ALL molecules are moving, thus the slower an enzyme works. As the temperature approaches the OPTIMUM temperature for the given enzyme, the enzyme maintains its shape and it moves faster and collides with more substrate molecules every minute so its rate of catalytic activity increases. HOWEVER, a few degrees or more higher than an enzymes optimum temperature will cause the enzyme to violently collide too fast with other particles and the enzyme will UNRAVEL and thus DENATURE; it loses its shape/active site and thus becomes unable to catalyze any more reactions.
We then saw a demonstration of catalase enzyme, which speeds up the breakdown/lysis of hydrogen peroxide into oxygen gas (bubbles).
We saw that at too high a pH (too basic) or too low a pH (too acidic), catalase did not catalyze the breakdown of hydrogen peroxide because the catalase enzyme had denatured!
Also, as temperature went from cold (10 C) to room temperature (23 C), the catalase enzyme activity increased BUT at a high temperature, the catalase activity dropped due to the UNRAVELING of the enzyme.
Bio 8- we continued our discussion of enzymes. We saw that the two main factors that determine that activity/rate of enzyme action are temperature and pH.
The lower the temperature, the slower ALL molecules are moving, thus the slower an enzyme works. As the temperature approaches the OPTIMUM temperature for the given enzyme, the enzyme maintains its shape and it moves faster and collides with more substrate molecules every minute so its rate of catalytic activity increases. HOWEVER, a few degrees or more higher than an enzymes optimum temperature will cause the enzyme to violently collide too fast with other particles and the enzyme will UNRAVEL and thus DENATURE; it loses its shape/active site and thus becomes unable to catalyze any more reactions.
# posted by C @ 8:46 PM 
