230_Sp10_L10_post-1 - CHEM 230 Sp10 Lecture 10 Chapter 7:...

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CHEM 230 Sp10 Lecture 10 Chapter 7: Measure and Calculate Entropy 1) Phase change 3) Δ S o rxn 4) Δ S Tot Session ID: 230
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Exam 1 Wednesday, May 19th 1:15 pm-2:45 pm CHEM 1400 Turn off all electronic devices except a non- programmable calculator Sit in alternate seats At end of exam stop and pass exams to GSIs before you get up GSIs may not answer content questions about the exam Equation sheet, periodic table; themochemical data. Worksheets and practice exams on CTools.
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Entropy Measurement Energy reversibly transferred as heat Constant temperature Units: J/K " S = q rev T Entropy is a state function path does not matter. Use reversible q and later w.
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Concept Question Which of the following has the greatest magnitude Δ S (i.e., ignore the sign), assuming a reversible process? A. Adding 100 J of heat to a system at 100 K B. Removing 100 J of heat from a system at 100 K C. Adding 200 J of heat to a system at 200 K D. Adding 10 J of heat to a system at 1 K " S = q rev T
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Concept Question Which of the following has the greatest magnitude Δ S (i.e., ignore the sign), assuming a reversible process? A. Adding 100 J of heat to a system at 100 K = 1 J/K B. Removing 100 J of heat from a system at 100 K = -1 J/K C. Adding 200 J of heat to a system at 200 K = 1 J/K D. Adding 10 J of heat to a system at 1 K = 10 J/K " S = q rev T
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230_Sp10_L10_post-1 - CHEM 230 Sp10 Lecture 10 Chapter 7:...

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