Ch_322a_3.02

Ch_322a_3.02 - bonding electrons. A : B ! + !"...

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Bond Making and Bond Breaking Processes: Heterolysis and Homolysis A covalent bond may break by either of two different processes: heterolysis or homolysis. Heterolysis ( Gr: hetero- "different" + lysis-"cleavage") A : B A + B: ions + - Double-barbed arrow is used to show movement of an electron pair. Homolysis ( Gr : homo-"the same" + lysis) A : B A . + B . radicals Single-barbed arrow is used to show movement of a single electron.
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Bond Heterolysis Bond heterolysis typically is found with polar covalent bonds where the intrinsic electronegativities promote polarization of the
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Unformatted text preview: bonding electrons. A : B ! + !" A + + B:-polar covalent bond Assisted Bond Heterolysis Bond heterolysis may be assisted by a second molecule or chemical species that can either donate or accept an electron pair. A : B ! + !" C: C: A : B ! + !" + C:A + B: +-C donates an electron pair in forming bond to A as B departs as anion. A : B ! + !" D + A : B D + + A + + B:D D + accepts an electron pair as it bonds to B releasing A + ....
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Ch_322a_3.02 - bonding electrons. A : B ! + !"...

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