Central Atom
Model
#
Name of
molecular
shape
Molecular
Formula
Structural
Formula
bonded
pairs
unshared
pairs
bond
angle
Molecular
Shape
Ball & Stick
Model
Questions:
1. For the model of methane, CH4, are all of the angles formed by any two C-H bonds the same?
2. Compare your models of methane, ammonia, and water. Should the bond angles in these models
be equal? Why or why not?
3. Which of the five molecules in your chart are polar molecules? Which are non-polar molecules?
4. Can a molecule with polar bonds be nonpolar? (Give an example with a diagram showing bond
polarity.)
5. Based on your results, predict the type of bonding, molecular geometry, and molecular polarity of
the following molecules.
a. HI
______________________
______________________
______________________
SH2 ______________________
______________________
______________________
c. NH3 ______________________
______________________
______________________
d.
______________________
______________________
b.
CO2 ______________________
6. Considering the similar molecular shapes of NH3 and CH4, what differences in your ball & stick
models may account for the differences in their measured bond angles?