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Lecture_12

# Lecture_12 - This Week For Lab"Molecular Geometry Chapter 9...

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This Week, 10/1/07 For Lab: “Molecular Geometry” Chapter 9 in your lab manual. Energy changes accompanying chemical changes can be added just like bond energies are added to get an overall ΔH. Reading assignments and learning objectives for lectures 12 &13 are available in WebCT. Homework due Friday at 6 PM

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Use bond energies to find the approximate energy released per mole in the combination of hydrogen and oxygen to produce water. 2H 2 + O 2 2 H 2 O D H-H = 432 kJ/mol D O-O = 498 kJ/mol D O-H = 467 kJ/mol Enter a positive answer with no decimal places. CPS question
Alternate Technique +2(432 kJ) + +498 kJ – 4(467 kJ) Add the H values: H = +2(432 kJ) + (498 kJ) + [–4(467 kJ)] = -506 kJ Break reactants into atoms Combine atoms into products

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The Big Picture The balance between electron/nuclear attractions and repulsions determines the length and strength of a covalent bond. A covalent bond involves the sharing of one or more pairs of electrons between two atoms.
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