Lecture 18_2 slides per page - Lecture18 CHMY141 Spring2016...

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2/29/2016 1 Lecture 18 CHMY 141 Spring 2016 Polarity It was previously discussed that diatomic molecules can be polar if the electronegativity of the two atoms differs If the bond is polar the molecule is polar. Larger molecules can be polar as well We must examine the interaction and addition of all bond polarities Polar bonds do not necessarily mean a polar molecule
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2/29/2016 2 Vector Addition in 1D Applies to linear molecules Dipoles lie in a direct line Vector Addition in 2D Apply this method to any molecule whose atoms lie in a single plane Parallelogram method Head to Tail method
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2/29/2016 3 Vector Addition in 3D Most complicated case The easiest way is to add two of the vectors together first and then add the third vector to the result Change a single 3D addition into two 2D additions
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2/29/2016 4 Molecular Shape and Polarity How can a molecule with polar bonds be non polar? (i.e. CO 2 )
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