Bonding Unit - Oakland Schools

Procedure
1. Before entering the lab, complete as much of the data table as possible.
a. Name each compound
b. Draw the Lewis do structure
c. Predict the geometry
d. Predict the polarity
i. If there is no dipole, write “no dipole” in the box
ii. If there is a dipole, draw an arrow to indicate the direction
2. At your computer, access the website
http://cheminfo.chem.ou.edu/~mra/jmol/jmol.php
3. For each of the molecules listed, there is a file under the pull-down menu in the
upper right corner of the screen. The numerical file number is provided under
the formula in your data table. Any molecule with an “x” at the beginning is at
the bottom of the list.
4. Do not worry about recording data in any of the grayed-out boxes.
5. Using the program, investigate each molecule:
a. You can label each element using the “element labels” check box
b. You can spin the molecule by clicking on one of the atoms and dragging it
around
c. You can check the polarity of the molecule using the “molecular dipole”
check box
i. If a dipole is present, a large dipole arrow appears, pointing
towards the direction in which electrons are pulled in the molecule
ii. If no dipole is present, then no arrow is displayed
d. Be sure to check the “multiple bonds” box to check for double and triple
bonds on each molecule
e. To identify bond length:
i. Double-click on one atom
ii. Move the cursor to the atom on the other side of the bond and
double-click again
iii. The bond length will be displayed in nanometers (nm)
f. To identify bond angle:
i. Double-click on one of the outside atoms
ii. Move the cursor and click once on the central atom
iii. Move the cursor and double-click on a different outside atom
iv. The bond angle will be displayed on the model
v. If the molecule is not symmetrical, try checking all of the bond
angles – they might not all be equal!