Friday, October 3, 2008
Fri-Day 2
AP Chem- Continue with the Chapter 7 HW questions, all of which you can do except #'s 30, 94, and 110; hand in your work on Monday. Also, peruse (the OPPOSITE of skim) the class handout on the explanations of the periodic trends and let me know if you have any questions about them on Monday. Also on Monday, I'll have you type your password into my online gradebook so that you can confirm/keep track of your grades on Blackboard
We continued our comparison and explanation of atomic sizes among isoelectronic species (atoms or ions) in terms of (1) Zeff , (2), # of OPEL's, (3) and electron-electron repulsion in the valence shell.
We then used those same factors to explain the Periodic Trends in First Ionization Energy.
We saw that metallic elements have low Zeff on their valence electron(s) and thus have low first IE and that nonmetallic elements have relatively high Zeff on their valence electron(s) and thus have higher first IE's.
We then used ORBITAL DIAGRAMS from the Quantum Model of the atom to explain ANOMALIES in the first IE trend. We invoked the concept of "shielding" WITHIN a principal energy level: the fact that "s" electrons are, on avg., closer to the nucleus than are "p" electrons so that the s electrons partially shield or BLOCK some of the positive nuclear charge from the p electrons thus making the p electrons easier to remove from the atom (lower than PREDICTED first IE!).
Continue with the Chapter 7 HW questions, all of which you can do except #'s 30, 94, and 110; hand in your work on Monday.
Bio 6- we described the structure and life function of the following cell organelles:
the cell membrane (regulation, transport), the cell wall (in plant and bacterial cells only), which just provides a supportive, protective framework for the cell membrane, the cytoplasm (the medium in which most metabolic activities/reactions occur and the nucleus (regulation, reproduction).
I'll attempt to post some of your grades (not the labs) on your password protected Blackboard account.
Bio 7/8- we described the structure and life function of the following cell organelles:
the cell membrane (regulation, transport) and the cell wall (in plant and bacterial cells only), which just provides a supportive, protective framework for the cell membrane.
I'll attempt to post some of your grades (not the labs) on your password protected Blackboard account.
We continued our comparison and explanation of atomic sizes among isoelectronic species (atoms or ions) in terms of (1) Zeff , (2), # of OPEL's, (3) and electron-electron repulsion in the valence shell.
We then used those same factors to explain the Periodic Trends in First Ionization Energy.
We saw that metallic elements have low Zeff on their valence electron(s) and thus have low first IE and that nonmetallic elements have relatively high Zeff on their valence electron(s) and thus have higher first IE's.
We then used ORBITAL DIAGRAMS from the Quantum Model of the atom to explain ANOMALIES in the first IE trend. We invoked the concept of "shielding" WITHIN a principal energy level: the fact that "s" electrons are, on avg., closer to the nucleus than are "p" electrons so that the s electrons partially shield or BLOCK some of the positive nuclear charge from the p electrons thus making the p electrons easier to remove from the atom (lower than PREDICTED first IE!).
Continue with the Chapter 7 HW questions, all of which you can do except #'s 30, 94, and 110; hand in your work on Monday.
Bio 6- we described the structure and life function of the following cell organelles:
the cell membrane (regulation, transport), the cell wall (in plant and bacterial cells only), which just provides a supportive, protective framework for the cell membrane, the cytoplasm (the medium in which most metabolic activities/reactions occur and the nucleus (regulation, reproduction).
I'll attempt to post some of your grades (not the labs) on your password protected Blackboard account.
Bio 7/8- we described the structure and life function of the following cell organelles:
the cell membrane (regulation, transport) and the cell wall (in plant and bacterial cells only), which just provides a supportive, protective framework for the cell membrane.
I'll attempt to post some of your grades (not the labs) on your password protected Blackboard account.
# posted by C @ 12:52 PM 
