109Exam IV 4.3-05

109Exam IV 4.3-05 - CHEM 109 FALL 2005 EXAM 4 SHOW ALL WORK...

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CHEM 109 FALL 2005 EXAM 4 – SHOW ALL WORK – NO WORK – NO CREDIT! 1. (10 pts) (a) In the box provided, diagram the complete Lewis electron dot diagram for the molecule XeF 2 . Name the molecular shape of the molecule. Molecular shape: _______________________ Is the molecule polar? ___________________ What is the hybridization of the central atom? __________ (b) In the box provided, diagram the complete Lewis electron dot diagram for the molecule BrF 5 . Name the shape of the molecule. Molecular shape: _______________________ Is the molecule polar? ___________________ What is the hybridization of the central atom? __________ 2. (10pts) (a) Hybridization helps explain several bond angles and observed molecular shapes. The N atom in the compound shown here (acrylonitrile; used to make nonlatex gloves) undergoes sp hybridization. First, fill in the orbital “boxes” drawn below with arrows to represent the valence electron configuration in a ground state N atom. Then, draw new orbital boxes to represent the hybridized and unhybridized orbitals after the sp hybridization process. Fill in the new boxes with arrows representing the correct number of electrons for nitrogen. hybridization 2 s 2 p (b) What is the bond angle around carbon atom #1? (from C to C to N) _______ (c) How many pi bonds could this hybridized N atom now form? ________ (d) Which is the shorter carbon to carbon bond, between C-1 and C-2 or between C-2 and C-3 ? (circle choice) 1 Draw the appropriate hybrid and unhybridized orbital boxes here and fill with the appropriate number of electrons. Fill in the ground state electron configuration of the nitrogen atom
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CHEM 109 FALL 2005 EXAM 4 – SHOW ALL WORK – NO WORK – NO CREDIT! 3. (15 pts) (a) One of the fastest reactions in nature is taking place right now. As you read this, light is striking this molecule in your retina and, in a few femtoseconds, changes it slightly. (This change sets up a nerve impulse that gives you vision.) The structure for Retinal is shown below. What are the bond angles or hybridization schemes around the labeled carbon atoms? (1)
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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109Exam IV 4.3-05 - CHEM 109 FALL 2005 EXAM 4 SHOW ALL WORK...

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