c101_f10_1129 - Bond properties Covalent bond: a bond...

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Bond properties Covalent bond : a bond formed by shared electrons. (remember, unequal electronegativity means unequal sharing of the electrons) Bond length : the most stable distance between two nuclei that are bonded together. (bonded atoms stretch back and forth like balls on a spring) Bond enthalpy : a measure of the stability of a bond, specifically, the change in enthalpy when a bond is broken. Always a positive number because breaking a bond requires an energy input. Also called bond energy, bond strength. Symbolized by BE, DE, D (dissociation energy).
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Chemistry 101 Fall 2010 2 Example : Calculate the enthalpy of reaction when propane (C 3 H 8 ) is burned. C 3 H 8 (g) + 5 O 2 (g) 3 CO 2 (g) + 4 H 2 O(g) Given in a table of data: BE(H – C) = 416 kJ/mol BE(C – C) = 356 kJ/mol BE(O = O, in O 2 ) = 498 kJ/mol BE (C = O, in CO 2 ) = 803 kJ/mol BE(H – O) = 467 kJ/mol You need to draw Lewis structures to see bonds:
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Chemistry 101 Fall 2010 3 Δ H ° = cost to break bonds – cost to make bonds Δ H ° = enthalpies of bonds broken in the reactants – enthalpies of bonds made in the products
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This note was uploaded on 03/05/2011 for the course CHEM 101 taught by Professor Scottnickolaisen during the Fall '11 term at California State University Los Angeles .

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c101_f10_1129 - Bond properties Covalent bond: a bond...

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