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Molecular Polarity

Molecular Polarity. 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

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Molecular Polarity

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  1. Molecular Polarity

  2. 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 • 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

  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. 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

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