Question Description
Modeling Molecules
Introduction:
You can represent a molecule twodimensionally, as a structural formula orelectron dot structure. Although such models are useful in certain contexts,they do not accurately represent bond angles between atoms or shapes ofmolecules. In this activity, you will construct threedimensional models ofseveral molecules. You will use electron dot structures and structuralformulas to inform how you construct the threedimensional models.
Materials:
jelly beans, gum drops or gumballs; toothpicks; twist ties; colored pencils orcrayons
Procedure:

Identify the chemical and structural formulas and electron dotstructures of the following molecules:
water, ammonia, carbon dioxide, fluorine, methane, ethane

Write the formulas and draw the twodimensional structures in thetable.

Chose one color candy to represent each atom of an element (e.g., redjelly bean = hydrogen). Create a key that identifies each element.

Use the candy, toothpicks, and/or twist ties to construct a threedimensional model of each of the aforementioned molecules.

Draw, as accurately as possible, each model in the table.

Answer the questions.
modeling molecules table
Questions:

Compare the information provided by a molecules chemical formula tothe information provided by its structural formula.

Fluorine is a toxic, reactive gas. Which representation (structuralformula, electron dot structure, or threedimensional model) wouldyou use to explain why fluorine so reactive? Why?

Identify the bond types between the carbon and the two oxygen atomsin the carbon dioxide molecule.

Explain why it is difficult to accurately represent ammonia twodimensionally.

What is the major difference between the twodimensional and threedimensional models of ethane and methane? When might you chooseto use a twodimensional model rather than a threedimensional modelwhen representing one of the molecules?
Modeling Molecules Introduction: You can represent a molecule twodimensionally, 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 threedimensional models of several molecules. You will use electron dot structures and structural formulas to inform how you construct the threedimensional models. Materials: jelly beans, gum drops or gumballs; toothpicks; twist ties; colored pencils or crayons Procedure: Identify the chemical and structural formulas and electron dot structures of the following molecules: water, ammonia, carbon dioxide, fluorine, methane, ethane Write the formulas and draw the twodimensional structures in the table. Chose one color candy to represent each atom of an element (e.g., red jelly bean = hydrogen). Create a key that identifies each element. Use the candy, toothpicks, and/or twist ties to construct a three dimensional model of each of the aforementioned molecules. Draw, as accurately as possible, each model in the table. Answer the questions. modeling molecules table Questions: Compare the information provided by a molecules chemical formula to the information provided by its structural formula. Fluorine is a toxic, reactive gas. Which representation (structural formula, electron dot structure, or threedimensional model) would you use to explain why fluorine so reactive? Why? Identify the bond types between the carbon and the two oxygen atoms in the carbon dioxide molecule. Explain why it is difficult to accurately represent ammonia two dimensionally. What is the major difference between the twodimensional and three dimensional models of ethane and methane? When might you choose to use a twodimensional model rather than a threedimensional model when representing one of the molecules?