EX 2 Practice - CHM 2046 10. EXAM‘ 2 Please Bubble in C...

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Unformatted text preview: CHM 2046 10. EXAM‘ 2 Please Bubble in C as the Test Form Codeyat-ihglgp of YOur Answer Sheet. Which reaction shifts left (gives NAR)? 1 C0;2 + Hzror : 1112044 + Hco; @ H2PO4_ + 1150; -.=-_ H4so3 + moi2 (3) H804" + 1100; : so:2 + H2C03 (4) use; + P04—3 .—_* so;2 + HPsz (5) HAc + HPOi’ ,-—-‘ Ac“ + HZPOI Which one of these should be the weakest acid? (3 HIO (as HOI) (4) HI03(as HOIOZ) (I) HClO (as HOCl) (2) HC103 (as HOCIOz) Which reagent could be used-to d_i_s_s_ol_.v_e__ solid Mg! 03);? Ksp = 5.6 it 10—12. (1) 1 M NH3 '(2) 1 M NaOH (3) -1 MNaNOg M NaHSO4 (5) l M Na2C03 Which serve as Lewis bases in this reaction? V ‘0 Ca+2 + HC03' + NH3 —> CaC03(s) + NH.+ (c) 0H— (d) NHa (b) 0‘2 (1) a and b (2) a and c @a and d An unknown might contain Al”, Mg”, and/or Ca+2 (the only anion is N033 To a solution of the unknown is added '6 M NH; plus a few drops of NaOH 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? (a) co;2 (4) b and c (5) b and d (1) Al+3 is Present, Mg+2 is Absent, Ca“2 is Unknown (2) Al+3 is Absent, Mg+2 is Present, Ca+2 is Present (3) Al+3 is Unknown, Mg+2 is Absent, Ca+2 is Present @ Al?“3 is Present, Mg+2 is Unknown, Ca+2 is Absent Al+3 is Unknown, MgJ'2 is Present, Ca+2 is Unknown Which CA/CB pair would work best to prepare a buffer with a pH of 10.5? NH4+INH3 (2) 11212047111104" (3) HPO4'2/P04—3 (4) ‘Hzcog/Hco; Hear/co;2 Which is closest to the [LI-1 of a 0.1 M NaH2P04 solution? Note that the HzPOF is amphoteric. (1) 7.2 (2) 2.1 (3) 9.8 (4) .7 ((5) 12.4 Complete and balance for reaction in acidic solution, adding H+ and H20 as needed. Using the smallest possible whole number, what is the coefficient of H4"? ' v + HClO -—+ V02+ +" or @3 Complete and balance for reaction in basic solution, adding 0H— and H20 as needed. Using the smallest possible whole numbers, what is the coefficient of OH‘? » K @ 6 Equal volumes of 0.4 M NH4Cl and 0.2 M NH3 are mixed. What is the LH of the solution? @ 8.9 (l) 6 (2) 2 (4) 4 (5) 5 NH3 + C12 —) N2 + Cl- (2) 2 (3) 3 (4) 4 (5) 5 ' (1) 11.1 '(2) 9.6 (3) 9.2 ‘ (5) 5.1 11. What is the value of the e uilibri ‘ _. Won? -.= PO4'3 + 2NH4“, K = ? (1) 14. ' (2) 9.5 x 105 @u x 10‘2 (4) 4.0 x 10'11 (5) 5.3 x 10" 12. What is [M102] for Mn(OH)2 (Ksp = 1.9 x 10‘”) shaken with a pH = 9.5 buffer? (1) 6x10’9M @ZXIOAM‘ (3)3x10‘5M (4)4x10'"7M (5)8x~10_5M 13. If [NH3] = 0.15 M, what is the ratio [Ag+] / [Ag(NH3)2+]?_ Ag” + 2 NH3 .—_* “(10113); K,= 1.7 x 107 ((1) 1.3 x 10'9 (2) 5.9 x 10‘3 @26 x 10'6 (4) 3.8 x 105 (5) 7.6 x 108 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(0H)z(s), K = Ksp'l = 1.8 x 1011 14. What is [323—] in the final aqueous solution? (1) 0.20 M (2) 0.020 M (3) 0.025 M 0.040 M (5) 0.050 M 15. What [Oi-l remains when the reaction is complete? (1) 0.010 M (2) 0.020 M (3) 0.060 M ® 0.040 M (5) 0.080 M 16. What is the small final [Mgf]? Use the K above, or Ksp for Mg(OH)z = 5.6 x 10—12. (1) 1.1 x10"8 M 4 (2) 1.4 x 10““M (3) 5.6 x 10"”M (4) 9.0 x 10‘15 M (5 3.5 x 10" M The next 3 items refer to the reaction shown, for which the data given are for 25 “C 1313(1) + Cl2(g) T—.‘— 2 BrCl(g), AH” = 29.3'kJ/mol and 118° = 105. J/mol K2 17. What is A9: at 25 °C? I (1) ‘ -31.3 kJ/mol @20 kJ/mol (3) 2.0 kJ/mol (4) 26.8 kJ/mol (5) 31.3 kJ/mol 18. What is the value of the eguilibrium K at 25 °C? (1) 0.013 @ 2.2 . » (3) 79 (4) 0.45 (5) 5.0 x 104 19. How will this reaction shift at high and low T? @ 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 20. Give the net ionic eguation for the reaction of Al;03(s) with N aOH(aq), forming 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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EX 2 Practice - CHM 2046 10. EXAM‘ 2 Please Bubble in C...

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