Chem271_S11_x2

Chem271_S11_x2 - Chemistry 271, Section 21xx Prof. Jason...

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Chemistry 271, Section 21xx Your Name: Prof. Jason Kahn University of Maryland, College Park Your SID #: General Chemistry and Energetics Your Section # or time: Exam II (100 points total) April 6, 2011 You have 52 minutes for this exam. Exams written in pencil or erasable ink will not be re-graded under any circumstances. Explanations should be concise and clear. I have given you more space than you should need. There is extra space on the last page if you need it. You will need a calculator for this exam. No other study aids or materials are permitted. Generous partial credit will be given, i.e. , if you don’t know, guess. Useful Equations: K a = [H + ][A ]/[HA] pH = – log([H + ]) K b = [HA][HO ]/[A ] K w = [H + ][HO ] pH = pK a + log [A ]/[HA] G ° = – RT ln K eq R = 0.08206 L·atm/mole K 0 °C = 273.15 K ln K eq = – H °/(R T ) + S °/R S q / T 0 R = 8.314 J/mole K = 1.987 cal/mole K S = k B ln W G = H T S E = Σ n i ε i W = N !/( n i !) n i / n 0 = exp[–( ε i ε 0 )/ kT ] N = Σ n i R = N A k B k B = 1.38 x 10 –23 J/K t = t –vx/c 2 Chemical standard state: 1 M solutes, pure liquids, 1 atm gases Biochemical standard state: pH 7, all species in the ionic form found at pH 7 nano: 10 –9 pico: 10 –12 zepto: 10 –21 Honor Pledge: At the end of the examination time, please write out the following sentence and sign it, or talk to me about it: “I pledge on my honor that I have not given or received any unauthorized assistance on this examination.” (+1 pt)
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Chemistry 271, Section 21xx Exam II, 4/6/2011 2/7 Score for the page 1. (24 pts) Multiple choice: Circle the single best answer for each question (a; 4 pts) An ensemble in statistical thermodynamics is:
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This note was uploaded on 01/29/2012 for the course CHEM 271 taught by Professor Staff during the Spring '08 term at Maryland.

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Chem271_S11_x2 - Chemistry 271, Section 21xx Prof. Jason...

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