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Class Notes Feb 12

# Class Notes Feb 12 - Announcements Friday Homework...

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2/12/2010 1 Announcements: Friday, February 12, 2010 Homework WebAssign #6- Due Wednesday, February 17 at 8:00 AM Recitation Week 5 – “Buffers and Titrations” Lab 3 - Titrations Complete prelab prior to recitation. Suggested Textbook Questions Continue reading Chapter 20. True or False? Students who come to class the day after an exam are the best. February 12, 2010 - CT#1 B. False C. There is not enough information to answer this question A. True Predicting the magnitude and sign of S for a reaction. Entropy and Moles of Gas solid liquid gas entropy Focus on number of moles of gas. If n gas increases, S > 0 If n gas decreases, S < 0 If n gas is constant, S ~ 0 Predict which of the following reactions has the largest positive change in entropy. February 12, 2010 - CT#2 A. H 2 O(l) → H 2 O(g) B. 2NO(g) + O 2 (g) → 2NO 2 (g) C. 2C(graphite) + O 2 (g) → 2CO(g) D. 3O 2 (g) → 2O 3 (g) E. NH 4 Cl(s) → NH 3 (g) + HCl(g) number of moles of gas entropy moles gas 1 0 = 1 2 3 = -1 2 1 = 1 2 - 3 = -1 2 0 = 2

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Class Notes Feb 12 - Announcements Friday Homework...

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