Modeling Molecules

 

 

Represent a molecule two-dimensionally, as a structural formula or
electron dot structure. Although such models are useful in certain contexts,
they do not accurately represent bond angles between atoms or shapes of
molecules. In this activity, you will construct three-dimensional models of
several molecules. You will use electron dot structures and structural
formulas to inform how you construct the three-dimensional models.
Materials:
jelly beans, gum drops or gumballs; toothpicks; twist ties; colored pencils or
crayons
Procedure:
1. Identify the chemical and structural formulas and electron dot
structures of the following molecules:
water, ammonia, carbon dioxide, fluorine, methane, ethane
2. Write the formulas and draw the two-dimensional structures in the
table.
3. Chose one color candy to represent each atom of an element (e.g., red
jelly bean = hydrogen). Create a key that identifies each element.
4. Use the candy, toothpicks, and/or twist ties to construct a threedimensional
model of each of the aforementioned molecules.
5. Draw, as accurately as possible, each model in the table.

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