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PE2 - CHM 2046 PRACTICE EXAM 2 1 Which reaction shifts...

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Unformatted text preview: CHM 2046 PRACTICE EXAM 2 1. Which reaction shifts right (has K > 1)? (1) Eco; + mm; @ H2C03 + HPOIZ (2) H28 + H2P04— : HS— + H3PO4 (3) H30; + H2130; : st03 + Hm,—2 (4) .2 HZPOI ;‘ H3PO4 + £11)sz (5) H2P04_ + CO3”2 : 111,0; + Hco; Which one of these should be the strongest acid? (1) HBrOz (as HOBrO) (2) HBrO3 (as HOBroz) (3) 1-1002 (as HOCIO) (4) HC103 (as HOCIOZ) (5) 11102 (as HOIO) Which serve as Lewis acids in this reaction? Ag20(s) + 2 NH4+(aq) + 2 C1“(aq) _> 2 AgCl(s) + 2 NH3(aq) + H2005) (a) Ag’“ (b) NH: (c) Cl“ (d) 11+ (1) a and b (2) a and d (3) b and c (4) b and d (5) c and d All of these salts are sparingly soluble in water. Nitric acid, HN03(aq), should dissolve all except which one of these? (1) AgCN (2) Al(0H)3 (3) CaCO3 (4) Mg3(PO4)2 (5) P1112 Which reagent, will precipitate only Al+3 from a solution containing Al”, Mg”, and Ca+2? (1) NH4+/ NH3 buffer (2) NH4NO3 (aq) (3) Na2C03(aq) (4) NaZSO4(aq) (5) NaOH(aq) Titration of NH3(aq) using HCl(aq) would produce, at the equivalence point, a NH4Cl(aq) solution. What indicator should be used to detect this equivalence point? (Assume 0.1 M concentrations.) NH3 + 1130+ —-> NH,+ + H20 (1) thymol blue (2) methyl orange (3) bromcresol green (4) bromthymol blue (5) alizarine yellow What is the eguilibrium constant for this reaction. Below, Ksp is that for Al(OH)3, Ka is that for HAc, and Kw is for water. Al(OH)3(s) + 3 HAc(aq) : A1+3(aq) + 3Ac-(aq) + 3 H20“), K= ? (1) Ksp-Ka3 (2) Ksp/Ka3 (3) KspKa3Kw3 (4) KspKw3/Ka3 (5) KspKa3 /Kw3 Complete and balance for reaction in acidic solution, adding H+ and H20 as needed. Using the smallest possible whole numbers, what is the coefficient of 11+? (3103‘ + v0+2 —+ or + V0; (1) 6 (2) 2 (3) 3 (4) 4 (5) 12 Complete and balance for reaction in basic solution, adding OF and H20 as needed. Using the smallest possible whole numbers, what is the coefficient of CE“? N2H4 + Zn —9 Zn(OH)4‘2 + NH3 (1) 6 (2) 2 (3) 3 (4) 4 (5) 12 10. To prepare a buffer with a pH = 10.0 using ECG; and C03‘2, what concentration ratio [HC03—1/[CO3—2] should be used? (1) 0.3 (2) 2 (3) 3 (4) 0.5 (5) 5 11. What is [CF] for PbClz (Ksp = 1.5 x 10""5) saturated in water? (1) 3.0 x 10_5 M (2) 0.0039 M (3) 0.008 M (4) 0.025 M (5) 0.031 M 12. For Mg(OH)2, Ksp = 5.6 x 10"”. At what lfl should Mg(OH)2 just start to precipitate, if [Mgfi = 0.01 M? * (1) 7.4 (2) 8.4 (3) 9.4 (4) 10.4 (5) 11.3 13. AgCl is moderately soluble in NH3(aq) as: AgCl(s) + 2 NH3(aq) : Ag(NH3)z+ + Cl", K = Ksp - Kr = 0.0031. If excess solid AgCl is shaken with 0.50 M NH3. what will be [Ag(NH3)2+] and {CH at equilibrium? Assume [N113] will still be 0.50 M at equilibrium. Note that [Ag(NH3)2+] = [Cl—1. (1) 7.8x10'4M (2) 1.6x10‘3M (3) 0.014M (4) 0.028M (5) 0.056M The next 3 items refer to the result of mixing 300. mL of 0.20 M NaH2P04 and 200. mL of 0.10 M NaOH. Reaction occurs essentially to completion as shown. The OH— is limiting and the result is a H2130; / HPO4‘2 buffer. mm; + OF —) 131130.,“2 + H20 14. What is [HPO4__21 in the final solution? (1) 0.10M (2) 0.020M (3) 0.12M (4) 0.040M (5) 0.08M 15. What is ratio [112120;] / [HPOIZ] in the final solution? (1) 1.0 (2) 2.0 (3) 3.0 (4) 0.33 (5) 0.50 16. Which is closest to the pgof the final solution? (1) 6.7 (2) 6.9 (3) 7.2 (4) 7.5 (5) 7.7 The next 3 items refer to the reaction shown, for which the data given are for 25 0C. N204(g) :3 2 N02(g) AG“ = 4.7 kJ/mol, AH“ = 57.1 kJ/mol, AS“ = 175 J/mol K 17. What is K at 25 0C? (1) 1.9 x 10_3 (2) 0.013 (3) 0.15 (4) 1.9 (5) 6.7 18. How will this reaction shift at high and low T? (1) Right at high T, Left at low T (3) Left at high T, Right low T (2) Right at high T, Right at low T (4) Left at high T, Left at low T 19. Estimate the T at which AG" = 0 and thus K = 1, (1) 1460 K (2) 27 K (3) 3060 K (4) 326 K (5) 570 K 20. Give the net ionic eguation for the reaction of A1203(s) with HCl(aq), forming a AlC13(aq) solution. Write your answer in the bottom margin of your answer sheet. ...
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