Polarity and Molecular Shapes

OBJECTIVES:
-Construct models like molecules
-Determine molecular shape
-Predict polarity of molecules
MATERIALS:
-Molecular Model Kit
PROCEDURE:
1) Build a model for your selected molecules.
2) Draw a three-dimensional structure of each molecule . Use solid lines to represent bonds in the plane of the paper, dashed lines for bonds that point back from the plane of the paper, and wedged lines for bonds that point out from the plane of the paper toward the viewer.
3) In a table, note the shape of each molecule, the bond angles, whether or not they will be polar, and whether or not they exhibit resonance structure.
ANALYSIS:
1) Explain how water shape causes it to be polar.
2) Describe how water’s properties would be different if the molecules were linear instead of bent.
3) Based on the results of this experiment, list the molecules from the experiment that would be water-soluble.
Here are some examples:
C2H4
compares to

C3H8