practice exam I key 2009

practice exam I key 2009 - CHEMISTRY 232 Hour Exam 1 D. LEE...

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1 CHEMISTRY 232 September 25, 2008 Hour Exam 1 D. LEE PRINT NAME and STUDENT ID :______________ Key ________________________ There are 6 pages on this examination including this cover page; take a moment to verify this. Write answers in permanent ink (not red) . Problem 1 (25 points) _________ Problem 2 (10 points) _________ Problem 3 (10 points) _________ Problem 4 (15 points) _________ Problem 5 (05 points) _________ Problem 6 (20 points) _________ Problem 7 (15 points) _________ Total (100 points) _________
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2 1. (a) (5 points) Taking the concept of valence for oxygen and hydrogen into consideration, draw two different connectivities (A and B where A has two hydrogen atoms connected to the carbon atom ) of a molecule with formula CH 2 O. C O H H A C O H B H (b) (5 points) Complete molecular structures for A and B in (a) to meet the best Lewis structure of each compound by adding all appropriate multiple bonds ( π -bonds if any), lone pairs of electrons, and formal charges at atoms if any (Zero formal charge doesn t have to be indicated). C O H H A C O H B H (c) (5 points) Draw another resonance structure ( B' starting from structure B with all appropriate multiple bonds ( π -bonds if any) and formal charges. Indicate which resonance form is a major contributor (more stable) and briefly explain your answer. C O H B H empty p orbital C O H B' H B is a major contributor. Although B' has carbon meeting the octet rule it has negative charge on the non-electronegative carbon atom and positive charge on the electronetive oxygen atom. (d) (5 points) Molecule
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practice exam I key 2009 - CHEMISTRY 232 Hour Exam 1 D. LEE...

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