Chem271_S11_x1 - Chemistry 271 Section 21xx Prof Jason Kahn...

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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 #: Exam I (100 points total) March 7, 2011 You have 50 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 = [BH + ][HO ]/[B] F = ma ¸ e i π + 1 = 0 PV = nRT K w = [H + ][HO ] = 10 –14 pH = pK a + log([A ]/[HA]) pH (e.p.) = (p K a1 + p K a2 )/2 R = 0.08206 L·atm/mole K 0 °C = 273.15 K p K a = –log( K a ) K p = K c (RT) n P 2 /a 3 = 4 π 2 /MG × E = – B / t 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 point extra credit for filling in this box
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Chemistry 271, section 21xx Exam I, 3/7/11 2/8 Score for the page 1. (20 pts) Fill in the Blanks Read the whole sentence before you fill in the blanks. (a; 2 pts) K c and K p are equal if the does not change during the reaction. (b; 2 pts) The value of the reaction quotient Q approaches as the reaction progresses. (c; 4 pts) At equilibrium, the rates of forward and reverse reactions are and are as each other. (d; 4 pts) The of a weak acid is a strong base whose pK b can be predicted from the pK a of the weak acid using the equation . (e; 2 pts)
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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_x1 - Chemistry 271 Section 21xx Prof Jason Kahn...

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