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Unformatted text preview: <>"? twwwwb 'WiS’ft‘cp X ~47) Covrlhwn Mill/“VB: (Awe/L CHM 2046 EXAM 3., FORM CODE A Nov. 17, 2006 Please bubble in A as the test Form Code at the top right ofyour anewer sheet. Failure to do this will result in a penalty of10points. 1. Based on E° information, K; for Al(H20)2 (OHh‘Taq) is closest to (1) 1x 11:)“12 (2) 1x 1023 (3) 1>< 1041 (4) x 103‘1 (5) 1x 1019. 2. he following species for which the strongest central-atom-to—peripheral-atorn covalent bond will be observed is (1) NBI'3 MNOZ‘ (3) BrNO (4) N20 (5) HONO. 3. For: H300) F‘ H20(g) at 25.0 °C, each of the following conditions is true except (1) 3° 1120(1) < 3° H20(g) @j/P 1120(1) > P H20(g) (3) as; is “+“ (4) AGf = AGf H20(g) (5) AHI- = TASP ®For graphite, CS“ and diamond, Cd, the following reaction which has the least enthalpic drive is (1 31' + 02(g) —> 002ng Cd + 2/3 03(3) -> 00205) 3) Ca + 2 0(3) —) 0020;) Cgr + 2/3 03(3) -—+ 002(3) (5) Cd + 02(g] —-+ 002(g). 5. For the half-reactions listed on the INFORMATION SHEET, the largest Egan can be obtained by coupling half-reactions (1) 1881,26 (2)73214 (3) 9&8 (4)12&19 (5) 2&6. ¢ 3 ased on atomic EN as well as orbital EN, for which of the following species is valence electron density stabilized to the greatest extent by the central at} m? @Tfia' (2) 803 (3) 0032- WQ-”' $1193. IS @The following reaction at, 25 °C for which AG: is “—" ' Cu(NH3)42+(aq) + 6 H300) —> Cu(H20)52+(aq) + 4 NH3(aq) gut’fiimi o HAc(l) + H200) —1 H3O+(aq) + Ac_(aq) 3) “2 AgCl(s) + stm) + 2 H200) —> Ag28[s) + 2 H30+(aq) + 2 Cl-(aq) ' 3003(5) + 5042131121) + 2 1120(1) —1 CaSO4-2H20(s) + 0032“{aq) H200) —"+ Heigl + 1/3 030%)- When 1 M HO_(aq) reduces Ag+{aq) giving Ag(s), H200), and 02(g), the number of moles of Ag(s) produced per mole of 02(g) produced is (1)2 >16 (3)5 (4)3 @4. If a pure metal oxide of the general formula M203 is melted and then electrolyzed with a 10.0 A current for 1.00 hr to give 5.60 g of the metal, the metal most liker is (1) Mg (2) Fe X Al (5) 211. Of the following listed systems at 25 “C, 1 atm, Ca003(s) should be most stable in 1 M 1111401 Eek/5.5 M K2804 jive/0.2 M NaF @1111: water 0.05 M “£12003”. I (tymesg'f 1A3 i. 11. The followmg listed pair of species which have the same shape is .flh—é_I(OH2)63+ & ASF52_ SbCl52— & 2+ 3 F 2+ + r5 86 Tel—’52" NH4+ & 8‘30le? 4 { J I? 3 & XEF5 for an aqueous solution of (HOhSOg, [H30+] = 8/5 Mi, [H3O+] for the solution is closest W15 x 10-2 (>§\2.5 ><10_2 M20 x 10-3 M411 )u<10“3 @o x 1013. :3 (he 5's in; i- um ngggfioo Germ Me A SWQM A [-2 @or: CaCOg(s) + H300) x——‘ Ca2+(aq) + HCO;‘(aq) + HO‘(aq), K = 9.9 x 10‘”. If, for this system, [“HZCOGH = [H0002_], the solubility of 03003(s) is closest to (1 5.5 x10“5 M (2) s2 ><10_2 M 4.7 x10“ M )0: 6.3 ><10_5 M 5 39.1 x 10*3 M . 14. Based on periodic size—trend considerations, the following sequence which correctly Orders the indicated species from smallest to largest is (1)) Na+ < Ca2+ < K+ < Ca+ ) Ca2+ < Na+ 4. 061*“ < K"' (3) K+ < Ca2+ < Na+ < Ca+ (4) Ca+ < Ca2+ < K+ c Na+ (5) Na+ < 021*" < K+ < Ca“. 15. Relative to Eflbcen for oxidizing the metal in acidic soln to give the hydrated metal cation, for the following metals the biggest boost in Efflfleu is obtained by oxidizing (1 211(5) in 1 M NaOH (2) 211(0):: 1 M NH3 (3) Ag(s) in 1 M HCl @AKS) in 1 M NaOH (5) Cu(s) in 1 M N113. Based on periodic size trends and ion-size considerations, for the following listed pairs it is " WsSible to determine with certainty the larger species between K and Ca+ (2) K+ and Ca (3) K+ and Ca+ @m and Cl- (5) Cl and Ca. ®If 50.0 mL of 0.25 M NHg is mixed with 75.0 mL of 0.20 M NH4Cl and then treated with 0.0125 mols HCl(g], the pH of the resulting solution will be closest to 0 )0 6.0 (3) 7.0 m 9.0 (5) 3.0. The strongest B/L acid among the following is probably (1) sun (2) stc @Dnzrre New (3) AsHa. 19 The strongest B/L base among the following is probably m SJ- (5&1er- @PH2- (4) Cl— flee. 20. Resonance stabilizes negative charge density for the conjugate base of each of the following B/L acids except (1) HOScO3‘ (2) HONO (3) (110)3no (4) “H2003” (5) 3CCH20H. 21. Based on induction, the weakest B/L acid among the following should be (1) 013000011 (2) csccsgcoon (3) F;CCHZCOOH @rsccngcoon (5) 1313000011. 22. If an electrochemical cell which operates spontaneously is made by coupling 1/2-cells 2. and 23. from the half-reactions listed on the INFORMATION SHEET, and all reactant concen~ trations are standard while all product concentrations are adjusted to 0.0010 M , EOE“ will be closest to (1) 2.5V (2) 3.6V (3) 2.0V v (3) 3.1V. @he following hydrated metal ion whose B/ L acidity can be rationalized using a simple )czuflpmbic model based solely on metal-ion positive charge density is 3+ (5) 3:58:22)? @dOth“ flames“ anOHzm 24. 11:3: (Ia—Cngs) + 3042*(aq) + HgSfaq) + 2 H200) # CaSO4-2H20(s) + HIS—(m1) + C02 (aq); K = 1.2. Therefore, if 1.0 mols CaCO3[s] is shaken in a solo containing [HS—h = = = [3042—11 — 1 0 and the S ' 1 1 — . , ystem volume 13 he I. t 1. amount of CaSO4-2HQO(S) resulting at EQ is closest to p a 0 L, the (1) 1.4111013 (2) 0.50 mols (3) 020111015 5 mols (5) 0.010 mole. ...
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This note was uploaded on 07/22/2008 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Ex 3 F06 - &amp;lt;&amp;gt;&amp;quot;? twwwwb...

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