Monday, November 13, 2006
Monday
AP: we had our thermo/quantum exam and tomorrow we dig into the chemical periodicity unit. I will work on grading those exams tonight.
D/G Honors: we will have a written-response exam this Thursday covering everything about the Quantum Mechanical Model of the atom. Our last written test covered everything through the Bohr Model of the Hydrogen atom. Since then, we have discussed the evidence that led scientists to refine that model of the atom to our current Quantum/Wave-Mechanical Model of the atom. We covered principal energy levels, energy sublevels, and orbitals. We drew electron configurations, which showed the number of valence electrons per atom; we discussed dia- and paramagnetism as related to orbital diagrams. We developed orbital diagrams for the first four periods of elements by following the Aufbau Principle, the Pauli Exclusion Priniciple and Hund's Rule. We also thoroughly explained the exceptions to the Aufbau Principle that occur in Cr,Cu, Mo, and Ag in terms of electron distribution and relative energies of the 4s and 3d sublevels (or the 5s and 4d sublevels).
Today, we discussed electron transitions between energy sublevels; for example an electron transition from a 2s orbital to a 3d orbital as a result of an absorption of a specific quantum of energy. We COMPARED energy sublevels between atoms of different elements and noted NOT ONLY the different levels of energy that each respective sublevel has BUT ALSO the different differences in energy between respective sublevels of two different element's atoms; these two factors CAUSE the different emission (or absorption) spectra among the various elements.
In D, we started the Periodic Table unit noting the s, p, d, and f-block elements. We will get to that in G tomorrow.
E: we described and started to explain the Periodic Table trend of atomic radius/size/volume across a Period from left to right (atomic size DECREASES) and down a Group (atomic size increases). ALL trends will be explained in terms of THE MOST IMPORTANT THING IN ALL OF CHEMISTRY: Zeff, which is EFFECTIVE NUCLEAR CHARGE on an electron or electrons AND also the number of OCCUPIED (by electrons) PRINCIPAL ENERGY LEVELS. We will continue with these explanations tomorrow until we finish all six trends. You will see that each trend has THE SAME explanation. We will have our next test on Thursday; do your hw and make sure that you can easily answer questions such as the ones in today's class practice "quiz".
D/G Honors: we will have a written-response exam this Thursday covering everything about the Quantum Mechanical Model of the atom. Our last written test covered everything through the Bohr Model of the Hydrogen atom. Since then, we have discussed the evidence that led scientists to refine that model of the atom to our current Quantum/Wave-Mechanical Model of the atom. We covered principal energy levels, energy sublevels, and orbitals. We drew electron configurations, which showed the number of valence electrons per atom; we discussed dia- and paramagnetism as related to orbital diagrams. We developed orbital diagrams for the first four periods of elements by following the Aufbau Principle, the Pauli Exclusion Priniciple and Hund's Rule. We also thoroughly explained the exceptions to the Aufbau Principle that occur in Cr,Cu, Mo, and Ag in terms of electron distribution and relative energies of the 4s and 3d sublevels (or the 5s and 4d sublevels).
Today, we discussed electron transitions between energy sublevels; for example an electron transition from a 2s orbital to a 3d orbital as a result of an absorption of a specific quantum of energy. We COMPARED energy sublevels between atoms of different elements and noted NOT ONLY the different levels of energy that each respective sublevel has BUT ALSO the different differences in energy between respective sublevels of two different element's atoms; these two factors CAUSE the different emission (or absorption) spectra among the various elements.
In D, we started the Periodic Table unit noting the s, p, d, and f-block elements. We will get to that in G tomorrow.
E: we described and started to explain the Periodic Table trend of atomic radius/size/volume across a Period from left to right (atomic size DECREASES) and down a Group (atomic size increases). ALL trends will be explained in terms of THE MOST IMPORTANT THING IN ALL OF CHEMISTRY: Zeff, which is EFFECTIVE NUCLEAR CHARGE on an electron or electrons AND also the number of OCCUPIED (by electrons) PRINCIPAL ENERGY LEVELS. We will continue with these explanations tomorrow until we finish all six trends. You will see that each trend has THE SAME explanation. We will have our next test on Thursday; do your hw and make sure that you can easily answer questions such as the ones in today's class practice "quiz".
# posted by C @ 5:35 PM 
