Chem271_F11_x1b

Chem271_F11_x1b - 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 I (100 points total) October 12, 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 x = ! b ± b 2 ! 4 ac 2 a 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 23xx Exam I, 10/12/11 2/8 Score for the page 1. (20 pts) Short Answer (2 pts each) pH of 1 M HCl pOH of 0.01 M KOH pH of equal volumes of 0.1 M HOAc (pK a 4.75) + 0.1 M NaOAc
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Chem271_F11_x1b - Chemistry 271, Section 23xx Prof. Jason...

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