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Objectives. I CAN determine the geometry and hybridizations of covalent compounds based on the VSEPR Model I CAN predict the polarity of covalent compounds using the VSEPR MOdel. Investigation. Work in groups of 3-4 Complete worksheet and shapes. STOP after every shape 1 minute per shape.

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objectives
Objectives
  • I CAN determine the geometry and hybridizations of covalent compounds based on the VSEPR Model
  • I CAN predict the polarity of covalent compounds using the VSEPR MOdel
investigation
Investigation
  • Work in groups of 3-4
  • Complete worksheet and shapes. STOP after every shape
  • 1 minute per shape
key point 1 what is the vsepr model
Key Point 1: What is the VSEPR Model?
  • The VSEPR (pronounced Vesper) Model is a model that tells us a molecule’s shape
  • The main rule of the VSEPR model is that electrons will repel each other (negative-negative) so they must be placed as far apart as possible
kp2 how do we use the vsepr model
KP2: How do we use the VSEPR Model?
  • In a covalent compound, each element has a number of bonding and nonbonding pairs of electronsaround the nucleus.
  • For example, in H2O, Oxygen has 2 bonding pairs and 2 nonbonding (lone) pairs
slide6

Bonding and nonbonding pairs of electrons are also called steric groups

  • Oxygen has a total of 4 steric groups
slide7

KP3: Once you know the number of steric groups, you can figure out the geometry of a compound by looking at the following chart:

slide8

Example: List the possible

  • shapes for the compounds
  • below:
  • CO2
  • NH3
  • PCl3
  • BeBr2
kp4 what does the vsepr model tell us about polarity
KP4: What does the VSEPR Model tell us about polarity?
  • A molecule will have a DIPOLE when the electrons spend most of their time on one side
  • Electrons will always spend the most time with the element that is most electronegative (highest electron affinity)
  • Remember: electron affinity goes UP as we move across the periodic table
slide11

Example 1: Let’s look at water. First, draw the bonds in H2O with Lewis Dot Structures.

Now, figure out what SHAPE H2O will be according to the VSEPR Model:

Now, which element is more electronegative? Oxygen or hydrogen? _____________________________

So, the electrons will spend more time with the ___________________ atom, and the pole will look like this:

slide12

Example 2: What about CO2? First, draw LDSs:

What SHAPE will CO2 be according to the VSEPR Model:

Now, which element is more electronegative? Carbon or Oxygen? _____________________________

Will this element have a dipole? ____________________

slide13

Example 3--CHALLENGE: What about NO3-? First, draw LDSs

What shape will NO3- be according to the VSEPR Model?

Now, which element is more electronegative? Nitrogen or Oxygen? _____________________________

Will this element have a dipole? ____________________