MOLECULAR MODEL LAB
Name & Formula |
Electro- |
Bond Polarity |
Drawing of Model |
Lewis Structure |
Symmetry |
Molecular Polarity |
Molecular Shape |
hydrogen
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methane
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ammonia
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hydrogen
bromide
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chloro-
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oxygen
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water
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carbon
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form-
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MOLECULAR MODEL KEY:
HYDROGEN = YELLOW
NITROGEN
= BLUE
CHLORINE =
GREEN
PHOSPHORUS = BLUE
CARBON =
BLACK
BROMINE =
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 __________________________.