NAME _____________________
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(5 points) Sample qualitative assessment question: Which of the following is a possible MO diagram for formaldehyde (CH2O)?
- Draw the Lewis structure.
- Determine hybridization of each atom.
- Select ONE diagram, A, B, or C.
- Fill in electrons for molecular orbitals.
- Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
- Assign the bond order for this species.
Lewis structure for CH2O:
(5 points) Sample qualitative assessment question: Draw an MO diagram for CO2.
- Draw the Lewis structure.
- Determine hybridization of each atom.
- Relative energies of atoms in the small molecule are assigned below.
- Indicate relative energy levels of atomic and hybrid orbitals for each atom. Since there are two oxygen atoms, put all 8 orbitals for oxygen on the side of oxygen.
- Draw in molecular orbitals.
- Indicate which atomic and hybrid orbitals are mixing to form new molecular orbitals.
- Fill in electrons for molecular orbitals.
- Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
- Assign the bond order for this species.
Lewis structure for carbon dioxide:
Carbon
Oxygen
(5 points) Sample qualitative assessment question: Draw an MO diagram for – CN (cyanide anion).
- Draw the Lewis structure.
- Determine hybridization of each atom.
- Relative energies of atoms in the small molecule are assigned below.
- Indicate relative energy levels of atomic and hybrid orbitals for each atom.
- Draw in molecular orbitals.
- Indicate which atomic and hybrid orbitals are mixing to form new molecular orbitals.
- Fill in electrons for molecular orbitals.
- Label σ, π, nonbonding (nb), σ*, and π* for each energy level.
- Assign the bond order for this species.
Lewis structure for cyanide anion:
Carbon
Nitrogen