Lecture 12 - CHM 115 Lecture 12 Todays Lecture Reading was...

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CHM 115 Lecture 12 Today’s Lecture Reading was KTT: Section 8.9 Lewis Structures (cont’d) Energetics of the Chemical Bond Bond Energy and Length Change in Enthalpy of a Chemical Reaction Next Lecture Section 8.6
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2 Drawing Lewis Structures Draw the Lewis Structure for HOBr.
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3 Drawing Lewis Structures C 2 H 4 Multiple bonds
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4 Multiple Bonds Sometimes pairs of atoms can gain an even greater energy Advantage by sharing more than one pair of electrons Bond Order: the number of pairs of electrons that are shared between two atoms.
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5 Resonance If we can write two or more valid Lewis structures, the actual electron distribution is an average of the distributions shown by the Lewis structures. NOTE!!!!! The double bond moves, NOT the atoms.
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6 Resonance Experimental evidence shows that both O—O Experimental evidence shows that both O—O bonds are equal in length (128 pm). bonds are equal in length (128 pm). The real structure is somewhere between these two structures. O O O + O O O +
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7 Exceptions to the Octet Rule Odd electron molecules Expanded, 3 rd period and beyond (lone pairs on Cl omitted)
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8 Energy Content There is a 25% loss in energy when using a mix of 85% ethanol and 15% gasoline as compared to 100% gasoline. Why? Ethanol:
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This note was uploaded on 12/13/2011 for the course CHEM 115 taught by Professor L during the Fall '02 term at Purdue University-West Lafayette.

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Lecture 12 - CHM 115 Lecture 12 Todays Lecture Reading was...

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