Wednesday, October 25, 2006
Wedcap
D/G Honors: we completed the evidence and explanation of the photoelectric effect experiment from Einstein which was consistent with Planck's Theory. In science, theories are not 100% definitively proved, but evidence can be shown to be consistent with a theory. Certainly, the evidence from the photoelectric effect was consistent with Planck's Quantum Theory of light/electromagnetic radiation.
We also showed further confirming evidence of Planck's Theory from the Compton Effect.
We now can use this information to explain the Bohr Model of the Atom.
Regents E: we further showed the Quantum Mechanical Model of the Atom: the Principal Energy Levels n= 1,2,3,4 etc. have one or more sublevels each: s, p, d, f...and each s sublevel has one spherical s orbital, each p sublevel has 3 dumbbell shaped p orbitals, each d sublevel has 5 (mostly) double dumbbell shaped d orbital and each f sublevel has 7 crazy-shaped f orbitals. There are a maximum of two electrons per orbital. For tomorrow and Friday, print out this periodic table so that you can keep track of the electron configurations.
Here you go, ENTER THE ORBITRON!
and here is a great electron configuration tutorial
and a helpful video (don't worry about the scientist's names, though)
We then wrote the electron configurations for the first 8 elements. These electron configurations tell us the regions of probability for electrons in the ground state of an atom. They also tell us the accurate and precise energy of each electron in the ground state of an atom. We will continue the electron configurations and orbital notations of the elements.
AP: we finished the Hess diagram and, from that, did a lattice energy calculation.
We then discussed bond dissociation energies (and AVERAGE bond dissociation energies for heteronuclear bonds). We then obtained good estimates of change in enthalpies of reactions by adding the total moles of bonds broken in a reaction times their respective BDE's to the total moles of bonds formed in a reaction times THE NEGATIVE of their respective BDE's (negative because BOND FORMATION IS ALWAYS EXOTHERMIC, NO EXCEPTIONS-a rarity in chem!).
We also showed further confirming evidence of Planck's Theory from the Compton Effect.
We now can use this information to explain the Bohr Model of the Atom.
Regents E: we further showed the Quantum Mechanical Model of the Atom: the Principal Energy Levels n= 1,2,3,4 etc. have one or more sublevels each: s, p, d, f...and each s sublevel has one spherical s orbital, each p sublevel has 3 dumbbell shaped p orbitals, each d sublevel has 5 (mostly) double dumbbell shaped d orbital and each f sublevel has 7 crazy-shaped f orbitals. There are a maximum of two electrons per orbital. For tomorrow and Friday, print out this periodic table so that you can keep track of the electron configurations.
Here you go, ENTER THE ORBITRON!
and here is a great electron configuration tutorial
and a helpful video (don't worry about the scientist's names, though)
We then wrote the electron configurations for the first 8 elements. These electron configurations tell us the regions of probability for electrons in the ground state of an atom. They also tell us the accurate and precise energy of each electron in the ground state of an atom. We will continue the electron configurations and orbital notations of the elements.
AP: we finished the Hess diagram and, from that, did a lattice energy calculation.
We then discussed bond dissociation energies (and AVERAGE bond dissociation energies for heteronuclear bonds). We then obtained good estimates of change in enthalpies of reactions by adding the total moles of bonds broken in a reaction times their respective BDE's to the total moles of bonds formed in a reaction times THE NEGATIVE of their respective BDE's (negative because BOND FORMATION IS ALWAYS EXOTHERMIC, NO EXCEPTIONS-a rarity in chem!).
# posted by C @ 6:45 PM 
