Molecular Geometry Lab
Linear shapes tend to be non polar if the same elements are combined.
Linear shapes are polar if 2 different elements are combined.
Pyramidal shapes are usually polar
Bent shapes are polar
Tetrahedral shapes are polar if not symmetrical, nonpolar if symmetrical
Construct each of the following:
FORMULA
NAME
# bonded
pairs
H2
Hydrogen
H20
Water
CH4
Methane
Cl2
Chlorine
NH3
Ammonia
HF
Hydrogen
Fluoride
# nonbonded
pairs
Shape
Polarity
Ball and Stick Sketch
Lewis Dot Structure
FORMULA
NAME
N2
Nitrogen
CO2
Carbon Dioxide
H2O2
Hydrogen
Peroxide
O2
Oxygen
H2S
Hydrogen
Sulfide
# bonded
pairs
# nonbonded
pairs
Shape
Polarity
Ball and Stick Sketch
1. Which molecules are non polar because all BONDS are non polar?
2. Which molecules have polar bonds but are non polar because of symmetry?
3. Why do we not represent ionic compounds with ball and stick models?
4. How does building molecular models help to determine the shape and polarity of the molecule?
Lewis Dot Structure