Chem271_S09_x2 - Chemistry 271 Section 21xx Your Name...

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Chemistry 271, Section 21xx Your Name: University of Maryland, College Park Your SID #: General Chemistry and Energetics Prof. Jason Kahn Exam II (100 points total) April 13, 2009 You have 53 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. Partial credit will be given, i.e. , if you don’t know, guess. Numbers to Live By: S q / T 0 pH = – log([H + ]) E = mc 2 S = k ln W G = H T S PV = nRT K a = [H + ][A ]/[HA] G ° = – RT ln K eq ¸ e i π + 1 = 0 W = N!/( n i !) n i / n 0 = exp[–( E i - E 0 )/ kT ] T M = H°/[ S°+ R ln( C T /4)] °C = °K – 273.15 R = 8.314 J/mole K E = E° – 2.303(RT/ n )log 10 Q 2.303RT/ = 0.0592 Volts at 25 °C G = – n E = 96500 C(oulomb)/mole 1 V = 1 J/C a 2 + b 2 – 2 ab cos C = c 2 Chemical standard state: 1M solutes, pure liquids, 1 atm gases Biochemical standard state: pH 7, all species in the ionic form found at pH 7 ln K eq = – H°/(RT) + S°/R 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.”
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