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Chapter 9
Now that the midterm is over you should be breathing a little easier. Stay up with the work on a daily basis so you do not fall behind.
WebAssign for chapter 9 is up.
Please look at chapter nine on the Chang Online Learning Center. Go through the Essential Study Partner partial pressures at some point before returning from Thanksgiving.
Upcoming Asssignments
Assignment 1: Do the first 4 problems on the Webassign. Do also 9.38 and 9.39.
As of 2/18, the chapter 10 webassign is up. Practice your molecular shapes.
There are two types of bonds: ionic and covalent.
Ionic bonds are the electrostatic attraction between positive and negative ions.
Covalent bonds are a pair of electrons shared between two atoms.
Electronegativity is a measure of how well an atom attracts electrons when bonded to a different atom. F is the highest = 4.0, and other values are relative to F. O is the next most, and then N and Cl are the next most.
Molecular geometries:
Remember:
| Bonded Atoms (B) + Lone Pairs (E) = | Hybridization | Electronic Symmetry |
|---|---|---|
| 2 | sp | linear |
| 3 | sp2 | trigonal planar |
| 4 | sp3 | tetrahedral |
| 5 | sp3d | trigonal bipyramidal |
| 6 | sp3d2 | octahedral |
Visit the University of Oregon website to get an excellent visual explanation of bonding. Rotate the different molecules yourself and view and hide the lone pairs. The Chime Plugin is required to view. This is available from MDL software with a free registration.
Another useful site for VSEPR is the Chang website. It has a shockwave movie that covers every possible situation from the above table. In addition there is an interactive determining molecular shapes tutorial on the same page.
