MOLECULAR MODEL LAB

Name & Formula

Electro-
negativity Difference

Bond Polarity

Drawing of Model

Lewis Structure

Symmetry
(Yes/No)

Molecular Polarity

Molecular Shape

hydrogen
H2

 

 

 

 

 

 

 

 

methane
CH4

 

 

 

 

 

 

 

 

ammonia
NH3

 

 

 

 

 

 

 

 

hydrogen bromide
HBr

 

 

 

 

 

 

 

 

chloro-
methane
CH3Cl

 

 

 

 

 

 

 

 

oxygen
O2

 

 

 

 

 

 

 

 

water
H2O

 

 

 

 

 

 

 

 

carbon
dioxide
CO2

 

 

 

 

 

 

 

 

form-
aldehyde
CH2O

 

 

 

 

 

 

 

 


phosphorus
trichloride
PCl3

 

 

 

 

 

 

 

 

MOLECULAR MODEL KEY:
HYDROGEN = YELLOW                            NITROGEN = BLUE                      CHLORINE = GREEN                    
PHOSPHORUS = BLUE                             CARBON = BLACK                       BROMINE = ORANGE                    
OXYGEN = RED                   
WOODEN STICKS = SINGLE BONDS                            METAL SPRINGS = DOUBLE BONDS

QUESTIONS:

1.)  What shapes of molecules ALWAYS yield polar molecules?  Why?

 

2.)  Explain why H2O is polar and CO2 is not.  Use Lewis structures to answer.

 

3.)  What kind of molecular polarity do you have if the molecule contains only nonpolar bonds?  Why?

 

4.)  What shapes are nonpolar molecules?  Are these shapes ALWAYS nonpolar molecules?  If not, give two examples (chemical formulas) when
      these shapes are polar molecules.

 

5.)  Explain why chloromethane is not symmetrical and polar.  Also, explain why methane is symmetrical and nonpolar.  Use Lewis structures to
      answer.

 

6.)  Fill in the blanks with either “symmetrical” or “not symmetrical”.
            * Polar molecules are __________________________.
            * Nonpolar molecules are __________________________.

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