Lecture_Notes_100909b

Lecture_Notes_100909b - Lecture Note 10/9/2009

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Free Energy y Free Energy – (G) the relationship between enthalpy and entropy of the system; deals with the temperature dependence of spontaneity
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Free Energy and Spontaneity Δ S Δ H Spontaneous? + - + + - - - +
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If a reaction is exothermic and has an increase in order, when will it be spontaneous? At all te mpe ra t ure s At h i gh m p e At low tem eratures Never 28% 9% 41% 22% 1. At all temperatures 2. At high temperatures 3. At low temperatures 4. Never
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Entropy Changes in Chemical Reactions
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Spontaneity y Predict the sign of Δ S sys for each of the following processes: { CO 2 (s) Æ CO 2 (g) (sublimation of dry ice) { CaO (s) + SO 3 (g) Æ CaSO 4(s) { I 2 (s) Æ I 2 (aq) (dissolution of iodine in water)
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Which of the following processes is spontaneous? Heat flow from a cold. .. Decompo s it i on of rust. Di f fusion of pe r fume . Al l a re sp o n ta e u No p ous 4% 17% 1% 36% 42% 1. Heat flow from a cold object to a hot object 2. Decomposition of rust (Fe 2 O 3 ) to iron metal and oxygen gas 3.
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This note was uploaded on 10/14/2009 for the course CHEM 105BLG at USC.

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Lecture_Notes_100909b - Lecture Note 10/9/2009

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