DO NOW Pick up notes. Get out Molecular Geometry sheet from yesterday.

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Presentation transcript:

DO NOW Pick up notes. Get out Molecular Geometry sheet from yesterday.

VSEPR TABLE Look on the back of your Molecular Geometry worksheet

PRACTICE

PRACTICE

PRACTICE

MOLECULAR POLARITY This is a result of bond dipoles (areas of unequal polarity) that do not cancel each other out. This is the polarity of the MOLECULE not the BOND. For molecular polarity, the shape of the molecule must be considered.

REMINDER This is not BOND polarity. You can determine the polarity of BONDS by determining the electronegativity differences of the two atoms involved. C – C nonpolar covalent diff = 0 Na – F ionic diff = 3.05 O - H polar covalent diff = 1.14

MOLECULAR POLARITY Take those same molecules and the polarity of the molecule will depend on the whole molecule, not just the bond. C – C nonpolar equal sharing Na – F polar unequal sharing C - H polar unequal sharing For a molecule, you must consider the shape and the terminal atoms.

MOLECULAR POLARITY LINEAR If the terminal atoms are the same, there are equal forces, so it is NONPOLAR. If they are not the same, it is POLAR. BeF2 – nonpolar HCl - polar

MOLECULAR POLARITY TRIGONAL PLANAR If the terminal atoms are the same, there are equal forces, so it is NONPOLAR. If they are not the same, it is POLAR. BCl3 – nonpolar BHCl2 - polar

MOLECULAR POLARITY TETRAHEDRAL If the terminal atoms are the same, there are equal forces, so it is NONPOLAR. If they are not the same, it is POLAR. CCl4 – nonpolar CHCl3 - polar

MOLECULAR POLARITY PYRAMIDAL Because of the unshared pair, there are unequal forces, so the molecule is POLAR. NH3

MOLECULAR POLARITY BENT Because of the two unshared pairs, there are unequal forces, so the molecule is POLAR. H2O

MOLECULAR POLARITY

SUMMARY NONPOLAR POLAR NONPOLAR POLAR NONPOLAR POLAR POLAR POLAR POLAR

What is the Molecular Polarity for these molecules?

REMEMBER! To determine BOND POLARITY, calculate the electronegativity differences. To determine MOLECULAR POLARITY, look at the shape of the molecule and the terminal atoms.

E- Dot Diagram for all atoms Bond Type (electro-negativity) TRY THIS Molecule Formula E- Dot Diagram for all atoms # shared/ bonded electrons # lone/ unshared electrons E- Dot Structure Shape of molecule Bond Type (electro-negativity) AlH3 PH3 CS2

Molecular Polarity?

TO DO Chemical Bonding handout due Thursday. Lab tomorrow.