Objectives:
Construct models of molecule :
- determine molecular shapes
- Predict polarity of molecules
Materials:
- Molecular model kit
Procedure :
- Build a model for each of the molecules listed on the data table on th back of this page.
(Some atoms can form multiple bonds.) - Draw the three dimensional structure of each molecule in table 1. use solid lines to represent bonds in the plane of the paper, dashed lines for bonds that point back from the place of the paper, and wedged lines for bonds that point out from the plane of the paper, and wedged lines for bonds that point out from the plane of the paper toward the viewer.
- note the shape of each molecule in the third column of table 1, the blond angles in column 4, whether or not they will be polar in column 5 and whether or not they exhibit resonance structure in column 6.
This is the guidelines to the models
This is Si2H6
Polar:No
This CO2
Polar: Yes
This is C2H4
Polar: No
This is C3H8
Polar: No
This is SF6
Polar: Yes
This is N2
Polar: Ionic
This is IF3
Polar: Yes
This is H2O
Polar: Yes
This is H2O2
Polar: Yes
This is HF
Polar: Yes
This is Si2H6
Polar:No
This CO2
Polar: Yes
This is C2H4
Polar: No
This is C3H8
Polar: No
This is SF6
Polar: Yes
This is N2
Polar: Ionic
This is IF3
Polar: Yes
This is H2O
Polar: Yes
This is H2O2
Polar: Yes
This is HF
Polar: Yes
Polar: No
Polar: Yes
This is CH4
In conclusion:
The shape of the Molecular structure is in direct relation to the number of valence electrons in each atom