Wednesday, November 16, 2011
Wednes-Day 1
AP Chem - we went through the electron configurations of elements through period 5, and explained four of the exceptions to the Aufbau Principle.
We then discussed the electron configurations of the stable ions of various elements, noting the "first in , first out" rule of losing valence electrons of transition metal atoms.
We saw the relative ease of determining the electron configurations of the (only) 11 non-metal elements that form anions.
We defined the term "isoelectronic", and then showed several isoelectronic species that make up a "series".
Bio - we discussed the regulation of genes in a cell; only certain genes are expressed, translated into the proteins that they code for, in a given cell, which causes the cell to be specialized. For example, the insulin gene is only turned "on" in certain pancreatic cells, and in no other cells in your body. We explained that it is exclusively the "environment", chemical and physical, of a cell that determines which genes are turned on or off. As a complex organism develops, different cells are in different chemical and physical environments, causing the different cells to specialize as different genes are turned on or off in the different cells.
We then discussed the electron configurations of the stable ions of various elements, noting the "first in , first out" rule of losing valence electrons of transition metal atoms.
We saw the relative ease of determining the electron configurations of the (only) 11 non-metal elements that form anions.
We defined the term "isoelectronic", and then showed several isoelectronic species that make up a "series".
Bio - we discussed the regulation of genes in a cell; only certain genes are expressed, translated into the proteins that they code for, in a given cell, which causes the cell to be specialized. For example, the insulin gene is only turned "on" in certain pancreatic cells, and in no other cells in your body. We explained that it is exclusively the "environment", chemical and physical, of a cell that determines which genes are turned on or off. As a complex organism develops, different cells are in different chemical and physical environments, causing the different cells to specialize as different genes are turned on or off in the different cells.
# posted by C @ 11:35 PM 
