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Unformatted text preview: Chem 162, Spring 2008, Prof. Norman, Mid-Term Exam #1, Page 2 1. Consider the molecule O 2 F 2 , which has the structure FOOF. a. (1 point). Draw the Lewis structure, showing the bonds and unshared electrons. .. .. .. .. : F O O F : .. .. .. .. b. (1 point). What can you say about the value of the F-O-O bond angle? It is less than the tetrahedral angle of 109.5 o (since unshared electron pairs take up more room than single bonds). c. (1 point). What is the electron-group geometry and hybridization around the O atoms? Geometry __ tetrahedral __ Hybridization _ sp 3 _ (since there are four electron groups around each O atom). d. (4 points). Draw a valence-MO energy-level diagram for O 2 F 2 . Label energy levels as , , n, *, or *; subscript these symbols with the contributing atom(s). Examples: O O , n F . Fill in the diagram with the correct number of electrons of each spin ( or ). ___ ___ * O F ___ * O O n O E n F O O...
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