August 27 - Lecture #2, August 29, 2008 Organic chemists...

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Lecture #2, August 29, 2008 Organic chemists study structure-activity relationships of carbon compounds. So, we will begin by reviewing structure and bonding and use simple examples to emphasize how structure affects reactivity. Later in the semester, we will study reaction mechanisms and learn about synthesis using retro-synthesis strategies. C H H H H Cl 2 light C H Cl H H This is a substitution reaction. Later, we will study the radical mechanism for the reaction. ConcepTest (CT) Consider the conversion of methane to chloromethane on reaction with Cl 2 in the presence of light (photochemical reaction). Predict the sign of Δ H for this reaction. (A) Δ H = 0 (B) Δ H > 0 (C) Δ H < 0 Corrected Answer: The enthalpy change for the reaction is the net result of bond breaking and bond making processes. Bond breaking (dissociation) is always ENDOTHERMIC, and bond formation is always EXOTHERMIC! In this example, the bonds broken are C-H and Cl
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This note was uploaded on 02/25/2010 for the course CHEM 3311 at Colorado.

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August 27 - Lecture #2, August 29, 2008 Organic chemists...

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