EX3 Sum09 - ---Print Name. Last: Owe First: ~ePage 1 Sign...

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Unformatted text preview: ---Print Name. Last: Owe First: ~ePage 1 Sign Name (pledged): ~. ~t')ryJe . Disc. Instr. Na e: ~.r~CHM 2046 .. J. C. Horvath EXAM 3 Summer, 2009 INFO: Sa~erules as for Exam 1. And this exam is worth 223 pls. Thus, up to 68 extra credit pts can be earned. 1. Write correct eqns for the following redox rxns. (Note: Part credit is earnable for correct'Y2-rxns if you cannot get the correct net rxn.) , a. ~(s)1s oxidized in 6 M NaOH. p-(,f( 1.4.)..-Z 1J2.~U) -I-*H01'tf~~CtrI~))((nt);ut) ~3 e-) (10) ~L:l",-6 U) +-'Z.e-~2 UOl'tJ .f-~ij) J ~., .' ~Aft} +-10 Uz.O il) + Z UOi'&l ~2.. 4llUll,,'-..(O"';'I1 + 31Jt. 111 b. AI(s) won't react in 9 M K2S04 but reacts readily in 9 M. (HO)2802 giving SU2(g) as one of the products. J. CAliP or '14.0lt9 ...,. ~/till.,t;'", ~.:1tr1 (10) ~( 9~O~,l-l-JJ'~otJ+-U ....-" ~~..r 5'11)0 ltl) ~, k ~ ~:< tJ.) "-1.... q ~tlt,)+ .3 /JOJIfl,.,) ~t M{dlI,.~~i+311;,.f)/lJ -I-3S~l)1c. Ca(s) reacts with great vigor in 9 M K2S04 giving a precipitate as the oxidation product. &w -I-S<9;-l-&) -I:-.:1.lJ,j)ILJ~('JO.,-'2~.W"":L.e-(10) 1.. H,J>llJ + 2..e"" ~:J-lit>b.rJ .,... IJu,J (a /,d.) r Sf):~l} + J.l.1Jz.O I.t) ~e.".. .s~'1'Z llJ UJ-r -Z /Jfil~,)-I-/J).LJ J 2. Based on information from Q.l, above, plus knowledge of material stability which has been considered in CHM 2046, answer the following questions: a. The oxidation of Ca(s) in 6 M NaOn is likely more thermodynamically favorable than the oxidation of AI(s) in 6 M NaOH. Why? ~CJl..Qz.~.J'tU1J!A3 .JWJ-d4-' LJ"~ql'1l(')..J'",'~Ml-4-1 d~'YlfIf~(8) ~q/"2 ~'l-S()'1It ~U~+t,~(A l~)r4-A. ~1tI.-4uA ~A-1(A.). I'GO.. ~~A1U-.h o.A-'JIll ~M~"t.,k~*itliu tte!4J klJ.. w.'GU~a-~,.oJ1~CIJ'f..w1~~~~~AMt4't.tiJU\le. b. Write the eqn for the ~.~nto be consider.ed in order to know the answer to 2.a. on a "for sure" b~sis.Then explain as necessary why knowledge of EO for this V2-rxn resolves the issue....
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EX3 Sum09 - ---Print Name. Last: Owe First: ~ePage 1 Sign...

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