lecture13 - Chem 1A Lecture 13: Multiple bonds and review S...

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Multiple bonds and review Chem 1A Lecture 13:
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Sigma bonding A single bond is a sigma bond. A sigma bond has end-to-end orbital overlap. It has its highest electron density along the bond axis.
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Pi bonding A double bond is one sigma bond plus one pi bond. A pi bond has side-to-side orbital overlap. It has its highest electron density above and below the bond axis.
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Pi bonding An aromatic ring has a pi-bonding system. The C-C bonds in the plane of the ring are sigma bonds. The electrons in the pi bonds are delocalized .
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Pi bonding A triple bond is one sigma bond plus two pi bonds. One of the pi bonds has electron density above and below the bond axis. The other one is in the front and the back. The molecule has cylindrical symmetry.
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Multiple bonds Use a valence bond theory to describe the types of bonds and orbitals in acetone (CH 3 ) 2 CO 1. Write the Lewis structure. O H H C H C H H C H (3 x 4) + (6 x 1) + 6 = 24 e - 2. Assign hybridization state of each central atom in the molecule. 1 2 3 carbon 1,3: sp 3 carbon 2: sp 2 oxygen: sp 2
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Multiple bonds 3. Write the valence electron energy level diagrams for each central atom and explain the hybridization. Use a valence bond theory to describe the types of bonds and orbitals in acetone (CH 3 ) 2 CO C 1,3 : 4 electrons, 4 ligands (sp 3 ) 2s 2p isolated carbon atom hybridized carbon atom sp 3 mix
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Multiple bonds 3. Write the valence electron energy level diagrams for each central atom and explain the hybridization. Use a valence bond theory to describe the types of bonds and orbitals in acetone (CH 3 ) 2 CO C 2 : 4 electrons, 3 ligands (sp 2 ) 2s 2p isolated carbon atom mix hybridized carbon atom sp 2 2p z
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Multiple bonds 3. Write the valence electron energy level diagrams for each central atom and explain the hybridization. Use a valence bond theory to describe the types of bonds and orbitals in acetone (CH 3 ) 2 CO O: 6 electrons, 1 ligand, 2 lone pairs (sp 2 ) mix hybridized carbon atom sp 2 2p z 2s 2p isolated oxygen atom
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4. Explain the bonding. Use a valence bond theory to describe the types of bonds
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lecture13 - Chem 1A Lecture 13: Multiple bonds and review S...

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