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.