Exam 1 - CHM 2046 EXAM 1 FORM CODE A Please bubble in your...

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EXAM 1 FORM CODE A 1/26/2009 1. What is the conjugate base of CH 3 COOH? (a) CH 3 COO - (b) CH 3 COOH 2 (c) CH 2 COOH (d) CH 2 COO - (e) CH 3 COO + 2. A Brønsted base is defined as a compound that is capable of. . . (a) donating a proton (b) accepting a proton (c) donating a neutron (d) accepting an electron (e) donating an electron 3. Which is not a strong acid? (a) Perchloric Acid (b) Hydroiodic Acid (c) Hydrobromic Acid (d) Hydrofluoric Acid (e) Nitric Acid 4. Having an extremely large equilibrium constant, K, indicates that a reaction. . . (a) is very fast (b) favors the forward reaction (c) favors the reverse reaction (d) both (a) and (b) are correct (e) both (a) and (c) are correct 5. Calculate the pH of a 0.04 M KOH solution. (a) 13.9 (b) 1.4 (c) 12.6 (d) 0.4 (e) 0.91 6. Without doing any explicit calculations, rank the following solutions in terms of increasing pH: 0.01M HNO 2 0.1 M KBr 0.1 M HNO 2 0.1 M KOH 0.01 M KOH 0.01 M NH 3 0.1 M HNO 3 Lowest pH Highest pH (a) 0.01 M KOH, 0.1 M KOH, 0.1 M KBr, 0.01 M NH 3 , 0.01 M HNO 2 , 0.1 M HNO 2 , 0.1 M HNO 3 (b) 0.1 M KOH, 0.01 M KOH, 0.01 M NH 3 , 0.1 M KBr, 0.01 M HNO 2 , 0.1 M HNO 2 , 0.1 M HNO 3 (c) 0.1 M HNO 3 , 0.1 M HNO 2 , 0.01 M HNO 2 , 0.1 M KBr, 0.01 M NH 3 , 0.01 M KOH, 0.1 M KOH (d) 0.1 M HNO 3 , 0.1 M HNO 2 , 0.01 M HNO 2 , 0.01 M NH 3 , 0.1 M KBr, 0.1 M KOH, 0.01 M KOH (e) 0.01 M KOH, 0.1 M KOH, 0.1 M KBr, 0.01 M NH 3 , 0.1 M HNO 3 , 0.01 M HNO 2 , 0.1 M HNO 2 7. What is the equilibrium constant, K, for the following reaction? CaCO 3 (s) + H 2 O(l) Ca 2+ (aq) + HCO 3 - (aq) + HO - (aq) (a) [Ca 2+ ][HCO 3 - ][HO - ] (b) [Ca 2+ ][HCO 3 - ][HO - ] (c) [Ca 2+ ] 2 [HCO 3 - ][HO - ] [CaCO 3 ][H 2 O] [CaCO 3 ] [CaCO 3 ] (d) [Ca 2+ ][HCO 3 - ][HO - ] (e) [Ca 2+ ] 2 [HCO 3 - ][HO - ] 8. Which of the following is not a Brønsted base? (a) NH 3 (b) F - (c) H 2 O (d) CH 3 COO - (e) They are all Brønsted bases 9. To synthesize the compound Cr(DPPZ)Cl 3 dmf, you must dissolve dipyridophenozine (DPPZ) and CrCl 3 ·6H 2 O into hot N,N-dimethylformamide (dmf) resulting in the following reaction: CrCl 3 ·6H 2 O(sol) + DPPZ(sol) + dmf(l) Cr(DPPZ)Cl 3 dmf(s) + 6H 2 O(sol) Note that “compound(sol)” indicates that the compound is dissolved in the solvent dmf. What is the equilibrium constant expression for this reaction? (a) 1 / ([CrCl 3 ·6H 2 O] [DPPZ] [dmf]) (b) [Cr(DPPZ)Cl 3 dmf] / ([CrCl 3 ·6H 2 O] [DPPZ] [dmf]) (c) [H 2 O] 6 [Cr(DPPZ)Cl 3 dmf] / ([CrCl 3 ·6H 2 O] [DPPZ]) (d) [H 2 O] 6 / ([CrCl 3 ·6H 2 O] [DPPZ]) (e) [H 2 O] 6 / ([CrCl 3 ·6H 2 O] [DPPZ] [dmf]) 10. Given that the following reaction is at equilibrium, what will be the effect of adding the highly soluble compound AgNO 3 to the system? AgCl(s) Ag + (aq) + Cl - (aq) (a) decrease solubility of AgCl(s) (b) increase solubility of AgCl(s) (c) no effect (d) increase K for the reaction (e) increase [Cl - ] Please bubble in your name, UFID #, and form code on the answer sheet using a #2 pencil. Note that the gas constant is 0.0821 L
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This note was uploaded on 03/02/2009 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Exam 1 - CHM 2046 EXAM 1 FORM CODE A Please bubble in your...

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