Name: __________________________
Date: ______________ Period: _______
Computer#: __________
MOLECULAR GEOMETRY, LEWIS STRUTURES AND VSEPR Std 2F
Zumdahl CD
1. Select “Chapter 11” from the main “Contents Menu”
2. Select “Exploration” from the “Overview Menu”
3. Select “The VSEPR Theory of Molecular Structure” from the window that comes up.
4. In the “Exploration” section read screens 1-4 and then copy the chart on page 5.
5. On page “5 of 6” copy the chart showing the various shapes you will get given the
Sets of Electron Bonding Pairs and Unshared pairs.to check out your Lewis Structure for
correctness.
6. On page “6 of 6” you will find “buttons” for 25 molecules. Do the first 24 but DO NOT DO
#25. Numbering of molecules is top row left to right (1-6), 2nd row left to right (7-12), and
so on. List each molecular formula, its Lewis structure, shape (bent, linear, tetrahedral,
trigonal planar or trigonal pyramidal) and why it is the shape your say it is. You should click
on “Examine Lewis Structure” to be sure you wrote it correctly. You should also click on
“Examine molecular shape”. Under the “Display” menu at the top choose “Ball and
Stick” option and then rotate the molecule to see how it is shaped.
Note: an X after the number for a molecule means that the Lewis Structure on the CD is wrong
and you will need to fix it.
Molecule Lewis Structure Shape Why this shape?
1.
BeF2
Straight, or linear
No unshared pairs on the central atom,
2 electron pairs on central atom
2.
BeH2
Straight, or linear
No unshared pairs on the central atom,
2 electron pairs on central atom
3.
BF3
Trigonal planar
No unshared pairs on the central atom,
3 electron pairs on central atom
4.
BH3
Trigonal planar
No unshared pairs on the central atom,
3 electron pairs on central atom
5.
CCl4
Tetrahedral
4 atoms around the central atom, no
unshared electron pairs on central atom
6.
CH4
Tetrahedral
4 atoms around the central atom, no
unshared electron pairs on central atom
7.X
CO2
Straight, or linear
No unshared pairs on the central atom,
2 electron pairs on central atom
