Practice EX 2 - CHM 2046 9. 10. EXAM 2 1 Please Bubble in A...

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Unformatted text preview: CHM 2046 9. 10. EXAM 2 1 Please Bubble in A as the Test Form Code at the Top Right of YounAnswer Sheet. ;’ .v‘ m Which reaction shfi Q left (gives NAR)? (1). ((30372 + H2PO4_ :2 11110.,—2 +_HCO; (2) H220: + Hso; -.=_-’e H4803 + Hear2 (3) 1180: + Hco,‘ =2 50...“2 + H2C03 (4) H803" + PO4‘3 —.—_> so;2 + mo." (5) HAc + HPO,‘2 :2 Ac' + HzPOf Which one of these should be the weakest acid? (1) HCIO (as HOCI) (2) H003 (as HOCIOZ) (3) HIO-(asHOI) (4) H103(as H0102) Which reagent could be used to dissolve solid Mggogh? Ksp = 5.6 x 10'”. (1) l M NH3 (2) 1 M NaOH (3) l M NaNO3 (4) l M NaHSO; ‘ (5) l M NazC03 Which serve as Lewis bases in this reaction? Ca+2 + Hco,‘ + N113 —> CaC03(s) + NHf’ (a) co;2 (b) o—2 (c) 0H— (d) NH3 (1) a and b (2) a and c (3) .a and d (4) b and c (5) b and d An unknown might contain Al”, Mg”, and/or Ca“2 (the only anion is N03? To a solution of the unknown is added 6 M NH; plus a few drops of N aOH to bring the pH to 11., This resulted in the formation of a precipitate. The precipitate was shaken with 1 M NaOH and solid remained. One may conclude what about the possible metal ions? (1) Al+3 is Present, Mg“z is Absent, Ca+2 is Unknown (2) Al+3 is, Absent, Mg+2 is Present, Ca+2 is Present (3) A]+3 is Unknown, Mg+2 is Absent, Ca+2 is Present (4) A113, is, Present, Mg+2 is Unknown, Ca+2 is Absent (5) Al+3 is Unknown, Mg+2 is Present, Ca+2 is Unknown Which CA/CB pair would work best to prepare. a buffer with a pH of 10.5? (1) NH4+INH3 (2) H,P0.,‘/HP0.(2 (3) HPQ4’2/PO4’3 (4)112C03/Hco; (5) Hear/co,"2 Which is closest to the p_I:1 of a 0.1 M N aHzPO4 solution? Note that the HzPOf is amphoteric. (1) 7.2 (2) 2.1 (3) 9.8 (4) 4.7 (5) 12.4 ' Complete and balance, for reaction in acidic solution, adding H+ and H10 as needed. Using the ' smallest possible whole number, what is the coefficient of H“? V + HClO. —), V02+ + Cl— ' (1) 6 (2) 2 (3) 3 .(4) 4 (5) 5 Complete and balance for reaction in basic solution, adding OH" and H20 as needed. Using the smallest possible whole numbers, what is the cog'gigient of QIF? NH, + (:12 —) N2 + c1“ (1) 6 (2) 2 (3) 3 (4) 4 (5) 5 Equal volumes of 0.4 M NH4Cl and 0.2 M NH3 are mixed. What is the pg of the solution? (1) 11.1 (2) 9.6 (3) 9.2 (4) 8.9 (5) 5.1 11. What is (M321 rot Mn(OH)2 (Ksp ——'~ 1.9 trio—‘3) shaken with a pH = 9.5 buffer? ' (1) 6 x 10" 10‘4 M (3) 3 x 10‘5 M (4) 4 x10"7 M (5) 8 x 10‘5 M 12. If [NH3] = 0.15 M, what is the _r_atio_ [Ag+] / [Ag(NH3)z+]? Ag+ + 2 NH3 :2 Ag(NH3)2+, Kf= 1.75: 107 “ ((1) 1.3 x 10" (2) 5.9x 10‘8 (3) 2.6 x 10‘6 (4) 3.8 x 105 V (5) 7.6 x 108 13. What is the value of the eguilibrium K for this reaction? HzPOf + 2 NH3 v—e Po.”3 + 2 NH], K = ?' (1) 14. (2) 9.5 x 105 (3) 7.1x 10‘2 (4) 4.0 x 10’11 (5) 5.3 x 10‘4 ———_———-__—_——————-I-——-_——__—_ The next 3 items refer to the reaction shown, for which the data given are for 25 “C Brz(£) + Clz(g) : 2 BrCl(g), AH°‘= 29.3 kJ/mol and AS°= 105. J/molK 14. What is A9; at 25 °C? (1) -31.3 kJ/mol (2) -2.0 kJ/mol (3) 2.0 kJ/mol (4) 26.8 kJ/mol (5.);433115‘RJ/mol «~2x../ 15. What is the value of the eguilibrium K at 25 0C? 5%? (1) 0.013 ‘ (2) 2.2 H (3) 79 (4) 0.45 (5) 5.0 x 104 16. How will this reaction Lift 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 The next 3 items refer to the result of mixing 400. mL of 0.10 M NaOH and 100. mL of 0.10 M Mg(N03)2. Reaction as shown goes essentially to completion. 2011- + Mg+2 —> Mg(OH)2(s), K '= Ksp'l = 1.8 x 10“ 17. ' What is [393’] the final aqueous solution? (1) 0.20 M (2) 0.020 M (3) 0.025 M (4) 0.040 M (5) 0.050 M 18. What [pill remains when the reaction is complete? (1) 0.010 M (2) 0.020 M (3) 0.060 M (4), 0.040 M (5) 0.080 M 19. What is the small final [Md]? Use the K above, or Ksti for Mg(0H)2 = 5.6 x 10‘”. (1) 1.1 x 10'8 M (2) 1.4 x 10"" M (3) 5.6 x 10'W M (4) 9.0 x 10—15 M (5) 3.5 x 10" M —————_——-—I—-I—-————_- 20. Give the net ionic eguation for the reaction of A1203(s) with Na0H(aq);.forlning a solution with the “aluminate” ion. Write your answer in the bottom margin of your answer sheet. ...
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This note was uploaded on 03/27/2012 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Practice EX 2 - CHM 2046 9. 10. EXAM 2 1 Please Bubble in A...

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