CHEM 1007 practice prelim2 - CHEM 1007: Optional practice...

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CHEM 1007: Optional practice problems for the second chem 2070 prelim exam 1. Sketch the bonding molecular orbital that results from the linear combination of two 1s orbitals. Indicate the region where interference occurs and state the kind of interference (constructive or destructive). 2. Draw an MO energy diagram and predict the bond order of Be 2 + and Be 2 - . Do you expect these molecules to exist in the gas phase? 3. Sketch the bonding and antibonding orbitals that result from the overlaps of the p z atomic orbitals in a homonuclear diatomic molecule. (Assume that the p z orbitals are those whose lobes are oriented along the bonding axis.) 4. Sketch the bonding and antibonding orbitals that result from the overlaps of the 2p x atomic orbitals in a homonuclear diatomic molecule. (Assume that the p x orbitals are those whose lobes are not oriented along the bonding axis.) 5. Use molecular orbital theory to predict the bond order of each of the following molecules or ions. Which molecules or ions will likely exist? (a) H 2 2- , (b) Ne 2 , (c) He 2 2+ , (d) F 2 2- 6. According to MO theory, which of the following has the highest bond order? Highest bond energy? Shortest bond length? C 2 C 2 + C 2 - 7. Bromine can form compounds or ions with any number of fluorine atoms from one to
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CHEM 1007 practice prelim2 - CHEM 1007: Optional practice...

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