1. Molecular Polarity

2. Make sense of problem and persevere in solving them
Objective
Today I will be able to:
Predict the molecular shape of a molecule using the VSEPR theory
Predict the polarity of molecules based on the molecular shape
Evaluation/ Assessment
Informal assessment – Listening to group interactions as they completethe molecular shapes lab and practice worksheets.
Formal Assessment – Analyzing student responses to the exit ticket and the practice worksheets.
Common Core Connection
Make sense of problem and persevere in solving them
Reason abstractly and quantitatively
Use appropriate tools strategically
Look for and make use of structure

3. Lesson Sequence Elaborate: Molecular Polarity Worksheet
Warm – Up
Explain: Molecular Polarity
Elaborate: Molecular Shapes Lab Polarity
Formal and informal assessment
Elaborate: Molecular Polarity Worksheet
Elaborate: VSEPR Theory Practice
Evaluate: Exit Ticket
Formal assessment

4. Warm - Up What does VSEPR stand for? What is the VSEPR Theory?
Why do the molecules form these specific shapes?

5. Objective Today I will be able to:
Predict the molecular shape of a molecule using the VSEPR theory
Predict the polarity of molecules based on the molecular shape

6. Homework
Finish VSEPR Theory Practice

7. Agenda Warm-Up Molecular Polarity Notes
Predicting Polarity in Molecular Shapes Lab
Molecular Polarity Worksheet
VSEPR Theory Practice
Exit Ticket

8. Polarity

9. Molecular Polarity
Just because a molecule has polar bonds does not mean it is a polar molecule
We have to look at the overall shape of the molecule
Two or more polar bonds may cancel each other out leading to a nonpolar molecule

10. A molecule will be nonpolar if…
All of the terminal atoms (or groups) are the same
If all of the terminal atoms (or groups) are symmetrically arranged around the central atom
The terminal atoms (or groups) have the same charges
Example: CO2
CO2 – no charge on either side (dipole) no attraction, reason it is a gas at room temperature

11. A molecule will be polar if…
One or more terminal atoms differ from each other
The terminal atoms are not symmetrically arranged
Polar molecules will have one slightly positive end and one slightly negative end
Example
H2O
NH3

12. Polarity Examples

13. Molecular Shapes Lab Revisit the molecular shapes lab
Fill out the column labeled polarity
Please ask questions!

14. Molecular Polarity Worksheet
Complete in class and we will review selected answers as a group

15. Complete worksheet, whatever is not finished will be your homework
VSEPR Theory Practice
Complete worksheet, whatever is not finished will be your homework

16. Exit Ticket Determine if the following molecules are polar or nonpolar
(Hint: Draw a Lewis structure)
Cl2
H2O
CH3Br
CH4