Tuesday, November 21, 2006
Thanksgiving-Eve Eve
AP: we barely got through a few points about the periodic trend in basicity to acidity of oxides (the group 13 and 14 elements are more amphoteric). We did a couple of equation-writing examples and then finished up with properties and group trends of the alkali ( "ends with an "I" = Roman numeral ONE = Group 1) and alkaline earth ( TWO words = Group 2) metals.
The Thanksgiving assignment is online. Our test on day six will cover (1) full explanations of all periodic trends, including anomalies (data WILL be given for any anomaly) in terms of Zeff, OPEL's and electron-electron repulsion, (2) electron configurations and quantum numbers, especially the configurations of transition metal ions (careful! first in- first out rule!), (3) full explanation of exceptions to the Aufbau Principle (do not dare misspell or abuse principle vs. principal...you will be using both terms heavily!) in Cr, Cu, Ag, or Mo.
MAKE sure that your explanations HEAVILY rely upon illustrations and orbital diagrams i.e. draw what is going on and then REFER to the relevant parts of your drawing throughout your explanation. If you ignore this advice (as many do), you may find that your answers lack sufficient detail and clarity (as many do).
Regents: we finished up our Periodic Table Unit, which will be tested next week (likely on Wednesday). We begin the most important unit in chemistry: Bonding, on Monday after our break. The Bonding unit relies heavily on your prior knowledge from the Atomic Concepts and the Periodic Table units. So, if you had trouble with those units, you are setting yourself up for failure if you don't come to extra help and clarify ANYTHING and everything that you didn't understand from the two previous units. Look over past unit homeworks, worksheets, and notes and bring to extra help any questions that you didn't understand.
Honors: We began the ultimate in explanations of all elemental properties and periodic trends: the calculation and relation of Zeff on an electron to the electron's attraction to the nucleus. The second major factor that is the number of OCCUPIED (by electrons) princiPAL energy levels in an atom. The third and final factor that we will use to explain everything in chemistry is the amount/degree of electron-electron repulsion in a given princiPAL energy level.
That's what we will cover all next week.
The Thanksgiving assignment is online. Our test on day six will cover (1) full explanations of all periodic trends, including anomalies (data WILL be given for any anomaly) in terms of Zeff, OPEL's and electron-electron repulsion, (2) electron configurations and quantum numbers, especially the configurations of transition metal ions (careful! first in- first out rule!), (3) full explanation of exceptions to the Aufbau Principle (do not dare misspell or abuse principle vs. principal...you will be using both terms heavily!) in Cr, Cu, Ag, or Mo.
MAKE sure that your explanations HEAVILY rely upon illustrations and orbital diagrams i.e. draw what is going on and then REFER to the relevant parts of your drawing throughout your explanation. If you ignore this advice (as many do), you may find that your answers lack sufficient detail and clarity (as many do).
Regents: we finished up our Periodic Table Unit, which will be tested next week (likely on Wednesday). We begin the most important unit in chemistry: Bonding, on Monday after our break. The Bonding unit relies heavily on your prior knowledge from the Atomic Concepts and the Periodic Table units. So, if you had trouble with those units, you are setting yourself up for failure if you don't come to extra help and clarify ANYTHING and everything that you didn't understand from the two previous units. Look over past unit homeworks, worksheets, and notes and bring to extra help any questions that you didn't understand.
Honors: We began the ultimate in explanations of all elemental properties and periodic trends: the calculation and relation of Zeff on an electron to the electron's attraction to the nucleus. The second major factor that is the number of OCCUPIED (by electrons) princiPAL energy levels in an atom. The third and final factor that we will use to explain everything in chemistry is the amount/degree of electron-electron repulsion in a given princiPAL energy level.
That's what we will cover all next week.
# posted by C @ 11:47 AM 
