Qz3KeyHA - CHM 2046 QUIZ 3 50 MINUTE TIME LIMIT P1114108...

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Unformatted text preview: CHM 2046 QUIZ 3 50 MINUTE TIME LIMIT P1114108 DIRECTIONS: Same rules as for 92 1. Pt value for each 9 is in left margin. Use Info Sheet as necessafl. fl - . Name (Pledged): «0” “Q’- {Regal DISC Instr. Name: 1. For 1/2—rxns on the INFORMATION SHEET, the largest “+"E°ce.. is obtained by coupling 1/2-r:ms (10) (1)9&14 {2)7&10 (3)12&15 (4)16&19 @5&28. 2. The following listed material which, at standard conditions, can oxidize iron in acidic soln is (10) (1IA925IS) (2)1MN30H (31' 9(0H2Is]3+ (‘4)[ZHIOI'IzIs]2+ (5)Fe(0H2)4(0HI2(5)- 3. If a 1.00 A battery is made from 14.64 g of a metal and can last for 12.0 hrs, the metal can be (10) (1) Fe (2) Ni (3) Cd @n (5) AI. 4 Left to right, the respective {0) states of the C atoms in HZNCHZCOOH (with fl O-to-O bonds), are (10) @1&+3 (2) +1 &—2 (3)o&+2 (4)—23.0 (5)—3&4. 5. Treating 1 M Kih'InO4 with 1 M HCI gives 02(9) and IIlIn02(s) as the (O) and (R) products. For this redox rxn the number of moles of H30+ consumed per mole of 02 produced is (10) (1) 5:3 @B (3) 3:4 (4) 5:4 (5) 4:5. 6. The following conversion which can be readily achieved in a single step is (10) (1) A923 —>Ag2o (2)” (3)2003 HAQCI (3) oaco3 —>Ca(0H)2 (4) AgBr —>AgCI (5) CaF2 weacoa. 7. For' H20(g) -’ H200) at 72 °c (10) (1)]A' f°|H20(l)>|AGf°|H20(g) (2) AGr" is+ (3)0Hr°is+ (4)A3r°is+ (5))TAS,°|>)AH,°|. 8. The following rxn at NLC for which |AHr°| is largest is (10) I1) -H(g) + '0ljlgl -* “20(9) (9) + 02(9) —> H20(I) (3) -H(g) + ~0H(g) -+ H20“) (4} H (9) + H019) "* H2 '- (5}‘/'2 “30130) + 1/2 HO'laCI) " H20“)- 9. Treating 0.35 mols CaF2(s) with 0.35 mols “H2003(aq)” will actually produce an amount of CaCO3(s) closest to (10) (1) 0.10 mols (2} 0.20 mols --@§ro mols (4) 0.35 mols (5) 0.70 mols. 10. Imagine that an electrochemical cell which operates spontaneously is constructed by coupling Vz-rxns 19. & 27. from the INFORMATION SHEET. a. Write the equation for the net cell rxn and calculate E°ce”. " E 2 (5? 95“? i' WI”ch it 1&0 if) *9 1371541; Mitigate, He”) 15.63? If . , 1f _ d, , (1a) 5193-!- 92333024,) -1~ tie a may; fl_ . ' .. _ . h . r» .3 . gen:- e A? w -+ 2mm)” 0....“ +4figi2itv1y-9 2 dstML-i- 9255??) “my: Eon 4' IZ’N b. What would happen to E"cell if the anode 1/2-cel| is treated with 1 M NaOH? Why? M I/z imam mud/1&4 J?) i (10) 247mg? Hs?ap+iaoa1)«e 4?;me 24,341.; .3. 2.5: E": +9.5.in 3.“. aim To an are: (H- l..23)/=-‘—'- IHZI/ J c. What would happen to E°cell if the cathode 1/2-ce|| is treated with 1 M NaOH? Why? Cdflmede kgth acnw’cfrée {I‘D ‘- (10) 6.1a); 4- 11.110 (.59 4- ‘ie'fl% Li i‘i‘flfut} (’5 b ' '* Mm" 9:, was; 4,1,; 45 9.03sz .4— eJ-ch = see-V d. What would likely happen to E"cell if Ag is replaced with Zn in the anode Vz-cell? Why? It‘ll?“ I'ngi/xrém and" 2?» {4 Mai if;de Judivxm 40mm 55 j I {‘9 E a T ’4' M Wei: fax?) unwed», 4’5 2H #9 E515 e. Could Ag serve as a suitable electrode material in the cathode 1/2-cell? Why or why not? Nag I/2”fiiPS'-‘h 25’Cm.3}>~oflv Sis-ei'i),¢vaw.-e- A? CWVL 243.9479? @ (as (Lot! acacia mum Iced <11. “(mmaamfrfi 4.. “(page 1(in 11. If moiten magnesium oxide is electrolyzed to produce 1.0 mols 02(9) and molten magnesium nitride is electrolyzed to produce 1.0 mols Nzlg), how will the quantities of produced Mg compare? Defend. (1c) '32 M50 3M5 4' 03- Mfigfllgm—aamé- ng—N’l —A> “+3émffly v5 [huff/vii, I10) I10) CHM 2046 QUIZ 3 50 MINUTE TIME LIMIT T:1 114/08 DIRECTIONS: Same rules as for z 1. Pt value for each is in left mar in. Use info Sheet as necessa . Name (Pledged): amt-’6 pa «(6 6 DISC Instr. Name: 1. Treating 1 M Killan4 with 1 M HCI gives 02(9) and Mn02(s) as the (O) and (R) products. For this redox rxn the number of moles of H30+ consumed per mole of 02 produced is (10) (1) SM (2) 4l'5 (3) 34 (4) 5i?) (5) 4 . 2. The following conversion which can be readily achieved in a single step is (10)@ A92003 —’AgCl (2) Can "’CaC03 (3) A928 *Agzo (4) AgBr -’AgC| (5) CaCO3 'Ca(OH)2. 3. For: H20(g) -|' H20(l) at 72 °C _ (10) (1) |TASr°| >|AHr°| (2) AHr° is + Gf") H20(l) >|AGf°| H20(g) (4) AG,° is + (5) AS,° is +. 4. The following rxn at NLC for which |AH,°| is largest is (10) (1) *H(g mg) -' H.200) (2) H19) + Ho'ig) -' “29(9) (3) «(9) + -0H(g) -> H2019) {4) H (g) + o "(9) -i H200) (5)1/2 H30 (aq) + v2 Ho'(aq) -i H20“). 5. Treating 0.35 mols CaF2(s) with 0.35 mols “H2003(aq)” will actually produce an amount of CaCO3(s) clo st to (10) re mols (2) 0.70 mols (3) 0.10 mols (4) 0.35 mols (5) 0.20 mols. 6. r ‘/2-rxns on the INFORMATION SHEET, the largest “+”E"cell is obtained by coupling 1/2-rxns (10) (1)16&19 &28 (3)9&14 (4)7&10 (5)12&15. 7. The following listed material which, at standard conditions, can oxidie iron in acidic soln is (10) (1)1 M NaOH (2) Fe(0H2)4(OH)2(s) (3) [Zn(OH2)5]2+ (OI-[2%]3+ (5) AgZS(s). 8. If a 1.00 A battery is made from 14.64 g of a metal and can last for 12.0 hrs, the metal can be (10) (1) Cd @n (3) Fe (4) Al (5) Ni. 9. Left to right, the respective (0) states of the C atoms in HZNCHZCOOH (with 119 O-to-O bonds), are (10) (1) -2&0 (2)-3&4 (3) +1 &—2 (4)0&+2 &+3. --_ _ --- ---_ -u _ w. --- --- --- ---- --- - II-w- ww—I- _ .. -—__ .. .._...... ....—- .. _-..- m... _ n-.. _--_ _-_ _ -- _ --_ _-.. _ u._ _ _..-_ _ _--_ _ ---_ _--- _ _--- _--_ --- _-- .- --- --_-_ _-.. .. n..._ — _—— _— 10. Imagine that an electrochemical cell which operates spontaneously is constructed by coupling 724‘an 19. & 27. from the INFORMATION SHEET. a. Write the equation for the net cell rxn and calculate EELS". (10) m 46...... “Fe 735947: b. What would happen to E°cen if the anode 1/2-cel| is treated with 1 M NaOH? Why? (10) c. What would happen to E°cell if the cathode 1/2-ce|l is treated with 1 M NaOH? Why? (10) cl. What would likely happen to 5°09" if A9 is replaced with Zn in the anode 1/2—ce|l‘? Why? (10) e. Could Ag serve as a suitable electrode material in the cathode 1/z-cel|'i’ Why or why not? (10) 11. If molten magnesium oxide is electrolyzed to produce 1.0 mols 02(9) and molten magnesium nitride is electrolyzed to produce 1.0 mols N2(g), how will the quantities of produced Mg compare? Defend. (10) ...
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This note was uploaded on 01/26/2009 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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Qz3KeyHA - CHM 2046 QUIZ 3 50 MINUTE TIME LIMIT P1114108...

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