SCH4U - Chemistry 12 (2024-25) - A

SCH4U – Lesson Plan 1-4

3-D Shapes: VSEPR

Lesson Big Idea:

3-D molecular shapes are determined by the types of bonds, number of atoms and electron configuration of the constituent atoms.  VSEPR is a theory that can be applied to predict and explain the shapes of molecules in 3-D space.  

Ministry Expectations:

C2.3predict the shapes using the valence shell electron pair repulsion (VSEPR) model, and draw diagrams to represent their molecular shapes [AI, C]

C2.4 predict the polarity of various chemical com- pounds, based on their molecular shapes and the difference in the electronegativity values of the atoms [AI]

C3.5 describe a Canadian contribution to the field of atomic and molecular theory (e.g., the work of Richard F.W. Bader of McMaster University on electronic density in small molecules; the work of Robert J. LeRoy of the University of Waterloo on the mathematical technique to determine the atomic radius of molecules known as the LeRoy Radius; the work of Ronald J. Gillespie of McMaster University on the VSEPR model)

Learning Goals:

By the end of this lesson you will:

• Understand how electrons behave within different bonds
• How to draw Lewis structures
• Understand VSEPR theory
• Be able to predict molecular shapes based on bonds, atoms and electron configurations

Success Criteria:

I know I have achieved the learning goals when I:

• Can produce lewis structures for atoms and molecules
• Can explain the concepts underlying VSEPR theory
• Can predict the shapes and bond angles within molecules

Assessments:

• Check your understanding – Quiz (AfL)
• Embedded questions within learning activities (AfL)
• Journal (AaL)