Chem271_F11_x2_v2

Chem271_F11_x2_v2 - Chemistry 271, Section 23xx Prof. Jason...

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Chemistry 271, Section 23xx Your Name: Prof. Jason Kahn University of Maryland, College Park Your SID #: General Chemistry and Energetics Your Section #: Exam II (100 points total) November 7, 2011 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. 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 K p = K c (RT) n P 2 /a 3 = 4 π 2 /MG x = b ± b 2 4 ac 2 a 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
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Chem271_F11_x2_v2 - Chemistry 271, Section 23xx Prof. Jason...

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