142_Exam_3_Practice_KEY-1

142_Exam_3_Practice_KEY-1 - Name: May 1, 2007 Lehman,...

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Unformatted text preview: Name: May 1, 2007 Lehman, Spring 2007 mistry 142 Exam #3 Practice Question 1. Balance the following redox reactions. a) HI + HN03 ~ 12 + NO (3 r- "' 1-:1- +- ?. e-- ) 3 ~e..- + 41t+-+ y.,JD':3,- ,;; 100 + Q tJ9-0 ):( b.L ' -f g H+ + :;ZIJ~- i9 '3.L 2 t- ?-tAJQ T '1 H~ 6 f.J- I + 6Z H tV 3 ;;> ~.I '2..+- d-..AJQ +- 4- H-2-V b) ~g + H2SO4-> Ag,S04 + SO, ) ~d- ~ A-~ +-4-..e.- ~ ;2.C+ Lf# + ~O4~----zE> s~ +- Q H.2-0 .9.~ + itl}+-t Sl{2---=D;)Ar/t-~.f AM iAfl-tJ + Q H~Wq---'7/1fg z/') '1 +-SO ~ +- tMf.2..0 c) MnCl2+ KMn04 + KOH ~ Mn02 + KCI F\ + ) C8.J~O ~ 1ft n Q+ ~ (f1 ~ {Y;2..+ If ~ +- e?e- '3 (3)e-+ t.fW + M t'1DLj- :> JV'I",[)2. +- ~ 1-I"2..o);;z + H-2.0 t- 3M n~+-t- ~t-\ t + ~ jV\(\4- i'3JY1Y101. .,.l2~.f-2Mr\4 +- + 'I~ \'2...~b-+ /:J..tJu- :3 Mn C.('2... + ~ K}\J1\4 + 4 KDH ?1 5JV\V\02 + ~{(CJ +- & (-/..2- d) H3As04 + Zn + HN03 ~ AsH3 + Zn(N03h ~ + (l tr~'+ ,450 "(~- - ~ ~1+:5 I- 4l.J.2.P [c- VI---7.:bY\?-~ + ~e. - ) Yf' 1\ 1-++ + A~r)Ll- 4- 4ln--z; A.~)-L3+ l.f&n'2.+-J. Lf 1+2-0 l-t-a A:sOLf r 8 H tJ 3 ,f- 4 =2Y1---;,!h.l+:1 + Lf ~ Y) (No.~)2.. + L/ Hi' e) P4 + NaOH ~ NaH2P04 + PH3 ~ Co ij~O of-'f'-(---iJ &.\u..2.fO~-t- :2..q t-t+ + 2lJe- ) 3 l'?-e-- +-l2 U+- + ~ ~ 't Ptf~)5 4~l-f'2.-+-3f'tt +fOO~+-+S"Rt---" I~H~~;-r-1-2..l~ t-2Drl~-rl-'Z{-\-- t-T~H - l<9<"6 u~o + l'A~I~-.f-~ Pq-oJ l ~ H2.-R9q +-:tA~O + ?-(S) rn ?>Co (../.'2-0 4 1~)H-+<6 p~ ~ l~uJb4-7 ~of'ff3 3- q [JJ) +- ~ P Lf +- '3 NoJ) W ~ '6 NfJt.H~fb'1 t- 5"""PH-3 Page 1 of 13 Name: May 1, 2007 Lehman, Spring 2007 Question2. Question3. Potassium was discovered by Sir Humphry Davy when he electrolyzed molten potassium hydroxide. Show this electrolytic cell and the electrode reactions. K+(i) + e ----i) K(~) G.-~ 4 E) H---c..Q..') ~ ~ (~)-I- ~ W(~) +- 4- e- ,ttVl ftclJL i:~} l A~ ~~I An iron rod is placed in l.OM iron(III) chloride solution and a zinc rod is placed in a l.OM zinc sulfate solution. Diagram this cell, give the cell potential, and give the shorthand notation. t e- ~ \:l3 r;Jl ttiJo r-e.~se- -fi 6r1-7",2\ 2e- Ccd-h~-6. dl-v An~ 0.1-<0 V [~): O.7-~V ~YI}2Y12t }J~~ lf~ Page 2 of 13 Name: May 1, 2007 Lehman, Spring 2007 Question4. Calculate the standard free energy change, using electrochemical potentials, for the reaction, Na(s) + 1/2Cl2(g)---+ Na+ + Cl- AJ---iO> AJ~ + +- e---- lkl"). +1 f.;---P ~CI - [~11 = 4,e?- V A~O ~-r-] FEel ::-/ (7t.JSOO-f;.;eJ lj,!J7-v JJ~O ~ 6 crz P.0 4--;).~/v J. /. ~ c, V Question 5.Question 5....
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142_Exam_3_Practice_KEY-1 - Name: May 1, 2007 Lehman,...

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