Lecture 2 - Read Chapter 9.1-9.6 (Doing 9.3 last) 1 PS1 Due...

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1 Read Chapter 9.1-9.6 (Doing 9.3 last) PS1 Due Friday, 2 PM (In Problem 5, heat capacity is C P )
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2 Exothermic (exo = out) In a non isolated system, releases heat to surroundings. Produces a temperature increase in an isolated system Heat transferred from system to surroundings: q sys < 0 System heat Surroundings Combustion of Methane: CH 4 (g) + 2O 2 (g) 2H 2 O (g)+ CO 2 (g) q ±-800±kJ* *Chemists and Physicists usually focus on the system .
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3 An endothermic process (q > 0): Mix barium hydroxide octahydrate with ammonium thiocyanate: Ba(OH) 2 .8H 2 O (s) + 2NH 4 SCN (s) Ba 2+ (aq) + SCN - (aq) + 2NH 3 (aq) + 10H 2 O(l) Law of Cons. of Energy: q sys + q surr = 0 q sys = - q surr (w = 0) q sys > 0: molecules absorb heat, gaining pot. energy q surr < 0: heat transf. from surroundings, T decreases. Note: - The above endothermic process occurred upon mixing . - The exothermic reaction of methane with oxygen did not occur upon mixing. Reaction required initiation by a flame.
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This note was uploaded on 04/16/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

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Lecture 2 - Read Chapter 9.1-9.6 (Doing 9.3 last) 1 PS1 Due...

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