Module 13 Labs
Learning Outcome
Learning Outcome
Students will conduct the experiments and observe the outcomes.
Materials
Materials
A handful of toothpicks
6 large foam balls (can use Play-Doh or marshmallows)
15 small foam balls (can use Play-Doh or mini marshmallows)
A notebook to record observations
Access to the following simulation: PhET Molecule Shapes Virtual Lab
Links to an external site.
Pre-Lab Questions
Pre-Lab Questions
- What does Lewis structure tell us about the geometry of a molecule?
- What else is important to remember when recreating molecular shapes?
Lab 1
Lab 1 Instructions
Using your knowledge of VSEPR Theory, use the large balls, toothpicks, and small balls to create a model for H2O, SO2, XeF2, and CIF3.
Use the table below to record the amount of large balls, small balls, and toothpicks you used for each.
|
Number of large balls |
Number of small balls |
Number of toothpicks |
Explanation on what you used and how you spaced the electrons (toothpicks) |
|
|
H2O |
||||
|
SO2 |
||||
|
XeF2 |
||||
|
CIF3 |
Lab 2
Lab 2 Instructions
Visit the simulation: PhET Molecule Shapes Virtual Lab Links to an external site.
- Click the link for the model.
- Build your models on the simulation using the information you have in your table to help guide you. Do they look different in the simulation?
- Go back to the simulation home screen and select real molecules.
- In the top right-hand corner, use the drop down menu to select a molecule.
- Check the box next to bond angles.
- Compare the simulation of the model to the model you built in Part 1. Was your model correct? Why or why not?
- Record your observations.
- Watch the following videos to clarify a common error when making these calculations:
Post-Lab Questions
Post-Lab Questions
- Which molecules do you predict would look the same? Why?
- How does electronegativity affect molecular geometry?