Unformatted text preview: 9/9/2009 Bond Energies
C + H C H + heat ( H°) What What are the relative energies of s and p orbitals? orbitals? C What is the order of following reactions with respect to What increasing heat released ( H)?
H H C H C + H H H C C H H i sp2 sp A. i < ii < iii
increasing heat of reaction B. i < iii < ii ii
increasing heat of reaction H C C + H H C C H px s py pz energy C. ii < iii < i
increasing heat of reaction s orbitals are more electronegative than p orbitals electrons in orbitals with more s character are more stable
1 H H C C H + H H H C H C H H H iii H H sp3 D. iii < i < ii
increasing heat of reaction bonds using orbitals with more s character are stronger success!
s p sp3 a lot of success but lot still under development. molecular orbital theory molecular valence bond theory valence from from the application of quantum mechanics to H· we can derive all of the atomic orbitals as well as their their hybrids. resonance (Lewis) structures molecular orbital theory molecular valence bond theory valence H1s H1s H· CH4 and larger and molecules molecules quantum quantum mechanics mechanics
3 Orbital Energy H H 4 valence bond theory valence resonance (Lewis) structures molecular orbital theory molecular For a C=C bond choose the -antibonding molecular orbital from the following list....
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This note was uploaded on 12/25/2009 for the course CHE 320 taught by Professor Ff during the Spring '09 term at SUNY Stony Brook.
- Spring '09