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Other bonding principles

Other bonding principles. Opps…. I forgot to include in Ch. 9. Bond Order (Bond now, I say!). The bond order is simply their number of bonding electrons shared by two atoms in a molecule A single bond has the bond order of one, double bonds two, triple bonds has a bond order of 3

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Other bonding principles

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  1. Other bonding principles Opps…. I forgot to include in Ch. 9

  2. Bond Order(Bond now, I say!) • The bond order is simply their number of bonding electrons shared by two atoms in a molecule • A single bond has the bond order of one, double bonds two, triple bonds has a bond order of 3 • It is possible to have a fractional bond order. This happens when you have resonance structures. • Bond order = # of shared pairs linking X and Y # of X and Y links in the molecule or ion Example of fractional: O3 would be 3/2 or 1.5

  3. Bond Length • The distance between two bonded nuclei • Bond lengths are averages but they do follow regular trends • If the pair of molecules are bigger, their bond length is bigger. (Going down - bigger, left to right – smaller) • If it is a higher bond order, the bond length is smaller.

  4. Bond Dissociation Energya.k.a Bond Energy • It is the enthalpy change for breaking a bond in a molecule with the reacants and products in the gas phase under standard condition. • Basically it is the amount of energy needed to break a bond. • The enthalpy change, (ΔH or D) for breaking a bond is always positive… What does that mean? • The formation of a bond releases the same amount of energy as it takes to break it • You can use this to estimate the overall enthalpy change of the reaction. • Pg. 422 for examples

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