Lecture 27 - Practice Predict the Molecular Geometry and...

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Tro, Chemistry: A Molecular Approach 1 Practice – Predict the Molecular Geometry and Bond Angles in ClO 2 F
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Tro, Chemistry: A Molecular Approach 2 Practice – Predict the Molecular Geometry and Bond Angles in ClO 2 F Cl = 7e O 2 = 2(6e ) = 12e F = 7e Total = 26e 4 Electron Groups on Cl 3 Bonding Groups 1 Lone Pair Shape = Trigonal Pyramidal Bond Angles O-Cl-O < 109.5° O-Cl-F < 109.5° Cl Least Electronegative Cl Is Central Atom O Cl O F •• •• •• •• •• ••
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Tro, Chemistry: A Molecular Approach 3 Polarity of Molecules in order for a molecule to be polar it must 1) have polar bonds electronegativity difference - theory bond dipole moments - measured 2) have an unsymmetrical shape vector addition polarity affects the intermolecular forces of attraction therefore boiling points and solubilities like dissolves like nonbonding pairs affect molecular polarity, strong pull in its direction
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Molecule Polarity The H-Cl bond is polar. The bonding electrons are pulled toward the Cl end of the molecule. The net result is a polar
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Lecture 27 - Practice Predict the Molecular Geometry and...

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