Happy Atoms Worksheet Page 24
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33Lewis Structures and Molecular Shape
Expected Activity Time: One class period (50 minutes)
Description of Lesson
Introduction (5-10 minutes)
1. The Valence Shell Electron Pair Repulsion (VSEPR) Theory helps us to predict the
shape (or molecular geometry) of molecules. 3-D models are helpful representations
to visualize what these molecules look like. A molecule’s shape will often influence
its function and use.
2. Use an oxygen and two hydrogen atoms to model how to make a water molecule
and to complete the same tasks students will do in their worksheet. Students can
follow along in their worksheet.
a. Demonstrate how to draw a Lewis Structure for this molecule.
b. Make the water molecule. Use the water molecule to describe the number of
ligands (2) and lone pairs (2) on the central oxygen atom to the students.
c. Take a picture using the Happy Atoms app, image the molecule, and show
students where to find the information about molecular geometry on the app.
d. Select the molecular angle button in the app to determine the molecular
geometry of the molecule.
Part I: Lewis Structures and Shapes (2-30 minutes)
1. Instruct students to make all the molecules on their worksheets, and to complete
table.
Wrap Up and Closing Discussion (5-10 minutes)
1. Briefly review the worksheet information with students, and answer any clarifying
questions.
2. Guide the discussion to get students to recognize the trends between steric number
and the geometry and bond angles.
3. Review the steric number table with students. You can use this step as a check for
understanding.
4. Most importantly, review the trends in molecular shape, and how Lewis Structure
can help determine this.
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