Lab-Molecular Geometry 2013

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Athens Area High School · Chemistry I
Name ________________________________
Period _____ Date ____________________
Lab: Molecular Geometry
Objectives: Build molecular compounds.
Procedure:
1. Make the following structures with the marshmallows and toothpicks.
2. For each molecule, choose one color of marshmallow for the central atom(s) and a second color of marshmallows
for the surrounding atoms.
3. Use the toothpicks for the bonds between the atoms. Arrange the atoms in the correct 3-D orientation they would
exist in nature. Remember lone pairs of electrons may affect the overall shape of the molecule.
4. Determine if the molecule is polar or nonpolar.
Compound
OCl2
PCl3
BeH2
BF3
AsF5
SeCl6
IBr
Version-13A
Lewis Structure
Shape
Polar or Nonpolar
Molecule
SiF4
C2H4
C2H2
Analysis: Answer the following using complete sentences.
1. Define the VSEPR theory and explain why water has a “bent” shape rather than a linear geometry.
2. Which of the geometries have all atoms in the same plane?
3. Did any of the molecules have double or triple bonds? Explain how you determined this.
4. How can you determine the polarity of a molecule from its geometry?
Version-13A
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