Today’s Do Now Write the Lewis dot diagram for the ionic bond between sodium and sulfur. Write the Lewis structure for the H2S molecule. Do resonance structures exist for either of the above compounds? Explain your answer.
Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes Practice Time!! 15 minutes Independent Practice 30 minutes Closing & Exit Ticket
This is going to get real… VSEPR This is going to get real…
By the end of the class period today I will be able to… draw and predict the VSEPR shape of molecules
Valence Shell Electron Pair Repulsions (VSEPR) a model used to predict the molecular structures of molecules
Valence Shell Electron Pair Repulsions (VSEPR) MAIN IDEA: the structure around a given atom is determined by minimizing repulsions between electron pairs
Why VSEPR? Consider SiF4 Lewis Dot Diagram VSEPR F Si F F F
Why VSEPR? VSEPR Lewis Dot Diagrams Predicts number and types of bonds between the atoms Indicates lone pairs of electrons 2D instead of 3D Predicts the shapes of molecules (3D) Provides NO information about presence of double or triple
VSEPR Shapes with 2 Electron Pairs on the Central Atom Linear Shape
Linear Shape Atoms Bonded to Central Atom: 2 Lone Pairs on Central Atom: 0 Pairs exist 180º from one another
Linear Shape: Example SiO2
VSEPR Shapes with 3 Electron Pairs on the Central Atom Trigonal Planar Bent
Trigonal Planar Shape Atoms Bonded to Central Atom: 3 Lone Pairs on Central Atom: 0 Pairs exist 120º from one another
Trigonal Planar: Example BF3
Bent Shape Atoms Bonded to Central Atom: 2 Lone Pairs on Central Atom: 1
Bent Shape: Example SO2
VSEPR Shapes with 4 Electron Pairs on the Central Atom Tetrahedral Trigonal Pyramidal Bent
Tetrahedral Shape Atoms Bonded to Central Atom: 4 Lone Pairs on Central Atom: 0 Pairs exist 109.5º from one another
Tetrahedral Shape: Example CCl4
Trigonal Pyramidal Shape Atoms Bonded to Central Atom: 3 Lone Pairs on Central Atom: 1
Trigonal Pyramidal Shape NH3
Bent Shape Atoms Bonded to Central Atom: 2 Lone Pairs on Central Atom: 2
Bent Shape: Example H2O
Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes Practice Time!! 15 minutes Independent Practice 30 minutes Closing & Exit Ticket
Guided Practice Time! 1. Draw the Lewis Dot Diagram for the following molecules 2. Predict the VSEPR shape for the molecule 3 minutes to work on each example
Practice Question #1 H2S
Practice Question #2 CI4
Practice Question #3 NBr3
Practice Question #4 SF2
Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes Practice Time!! 15 minutes Independent Practice 30 minutes Closing & Exit Ticket
Today’s Game Plan Do Now 10 minutes INM: VSEPR 25 minutes Practice Time!! 15 minutes Independent Practice 30 minutes Closing & Exit Ticket
Gallery Walk With your partner, create one of the VSEPR shapes learned today using marshmallows and toothpicks. Rotate groups to identify with your partner the proper VSEPR shapes
Today’s Homework Complete VSEPR worksheet