Bond Energies

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8 Terms

1
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Bond energy (bond dissociation energy)

  • the amount of energy needed to break a chemical bond


2
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As the number of bonds _______, bond length ________.

INCREASES, SHORTENS

3
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More energy is required to break ________ bonds than _______ bonds.

MULTIPLE, SINGLE

4
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Electronegativity difference

  • higher electronegativity difference USUALLY forms stronger bonds

    • an example of an exception is C-C


5
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Bond stability

  • high bond stability is a very important factor in bonding

  • stronger/more stable bonds will have higher thresholds


6
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Breaking bonds

  • must happen first

  • energy must be added

  • endothermic process

  • (+)


7
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Forming bonds

  • releases energy

  • exothermic process

  • (-)


8
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Enthalpy change for a reaction can be described as…

  • the sum of the total energy required to break old bonds (+) and the total energy released while forming new bonds (-)