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Unit 5: Bonding and Molecular Structure

Unit 5: Bonding and Molecular Structure . Bond Polarity. Most molecules have some sort of polarity in the bonds. Your book uses E lectronegativy values to determine polarity…. H-F or H-I?. B-C or B-F?. Unit 5: Bonding and Molecular Structure . Molecular Polarity.

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Unit 5: Bonding and Molecular Structure

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  1. Unit 5: Bonding and Molecular Structure Bond Polarity Most molecules have some sort of polarity in the bonds. Your book uses Electronegativy values to determine polarity… H-F or H-I? B-C or B-F?

  2. Unit 5: Bonding and Molecular Structure Molecular Polarity The polarity of an entire molecule must factor in the shape of the molecule, the lone electron pairs and the bond polarities within. Compare H2O and CCl4

  3. Unit 5: Bonding and Molecular Structure Molecular Polarity Generally, anything that creates asymmetry within a molecule, will result in the molecule being polar. Lone pairs Different atoms

  4. Unit 5: Bonding and Molecular Structure 1. CH3Cl 2. CHF3 3. BF3 4. NH3 5. SF4 6. BrF5

  5. Unit 5: Bonding and Molecular Structure Other Bond Properties Bond Order, see ozone . . . Bond Length Rule for single bonds Rules for multiple bonds Rank C=C, C=O and C=N bonds Bond Dissociation Energy Rank C-C, C=C and C≡N

  6. Unit 5: Bonding and Molecular Structure Bond Dissociation Enthalpies:

  7. Unit 5: Bonding and Molecular Structure Bond Dissociation Enthalpies: Hydrogenation of propene to propane … Dissociation enthalpies can be used to calculate the enthalpies of reaction involving molecules!!! H H H H H H H H – H C – C – H – C – C = H – C – H C –  H H H H

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