CHEMISTRY 112 EXAM 3 April 4, 2012 FORM A. Go on to the next page. Chemistry 112 Name Exam III Form A Section April 4,
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1 Chemistry 112 Name Exam III Form A Section April 4, IMPORTANT: On the scantron (answer sheet), you MUST clearly fill your name, your student number, section number, and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. CHEMISTRY 112 EXAM 3 April 4, 2012 FORM A 1. Which of the following is likely to yield the most acidic solution when dissolved in water? A. Li 2 O B. CaO C. Al 2 O 3 D. SiO 2 E. SO 3 2. Which atom below has the lowest electronegativity? There are 24 questions on this exam. Check that you have done all of the problems and filled in the first 24 bubbles on the scantron. Your score will be reported in percent (max 100%). Exam policy Hints Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). You must turn in your cover sheet with your scantron answer form. As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing. A. Cl B. N C. Si D. Mg E. K 3. Pick the species in which the central element can be further oxidized. A. CO3 2 B. SiO4 4 C. PO4 3 D. IO4 E. SO3 2
2 4. What is the maximum concentration of Cd2+ that can exist in a solution in which the S2 concentration is 2.5 x 10 6 M? [Ksp (CdS) = 8.0 x 10 27] A. 8.9 x B. 2.2 x C. 3.2 x D. 2.0 x E. 5.2 x If the ph is lowered, the solubility of which one of the following compounds will increase: A. AgCl B. AgI C. PbSO4 D. PbCl2 E. PbCO3 6. The Ksp for Zn(OH)2 is 5.0 x Determine the solubility of Zn(OH)2 in a solution with ph of A. 5.0 x 106 mol/l B. 1.2 x mol/l C. 1.6 x mol/l D. 5.0 x mol/l E. 1.6 x 10 9 mol/l 7. Which one of the following substances, when added to a saturated solution of CaCO3, will decrease the solubility of CaCO3 in the solution? A. NaCl B. CaCl2 C. HCl D. HNO3 E. NaNO3 8. Which of the following decreases when solid Ba(OH)2 is added to a saturated solution of BaCO3 (Ksp = 5.1 x 10 9 )? A. [Ba 2+ ] B. [CO3 2 ] C. [OH ] D. ph E. none of the above 9. Solid NaBr is slowly added to a solution that is M in Cu + and M in Ag +. Which of the following statements is true? (K sp for CuBr = 5.3 x 10 9 ; K sp for AgBr = 5.0 x ) A. NaBr will precipitate first B. CuBr will precipitate first C. AgBr will precipitate first D. no precipitate will form when [Br ]=0.010 M E. none of the above
3 10. What is the concentration of free cadmium (II) ion in solution when the total Cd(II) concentration (free ions + complex ions) is 0.20 M, and the solution also contains 2.0 M sodium cyanide (NaCN)? (K f for Cd(CN) 4 2 = 7.1 x ) A. 2.0 M B M C. 1.4 x M D. 1.8 x M E. 3.1 x M 11. The oxidation state for chlorine in HClO 4 is: A. 1 B. 0 C. +3 D. +5 E Which of the following is the best oxidizing agent? A. F B. I 2 C. H 2 D. Zn 2+ E. Li How many grams of Ca metal would be produced by the electrolysis of molten CaBr2 using a current of 30.0 amp for 10.0 hours? A g B. 452 g C g D. 224 g E g 14. When an aqueous solution that is 1M each in HCl, CuCl2 and CoBr2 is electrolyzed, the elemental products formed initially at the cathode and anode are, respectively A. Zn(s) and Cl2(g). B. Cu(s) and Br2(g). C. H2(g) and Cl2(g). D. Zn(s) and Br2(g). E. H2(g) and Br2(g). 15. An voltaic cell is made from Pb and Co electrodes, immersed respectively in 1.0 M solutions of Pb(NO3)2 and Co(NO3)2. Which statement is true concerning the reaction: Pb 2+ (aq) + Co(s) Pb(s) + Co 2+ (aq) A. E 0 (cell) = 0.41 V B. G 0 > 0 C. The voltage will increase as the mass of the Pb electrode is increased D. The reaction is non-spontaneous as written. E. The cell voltage will decrease as more Co 2+ is formed. 16. Which of the following is true under standard conditions? A. Fe 3+ is a stronger oxidizing agent than O2 B. F is a good reducing agent C. Zn metal can be produced by electrolysis of aqueous ZnCl2 D. Cu 2+ can oxidize Ag E. Cu 2+ can be reduced by H2.
4 17. What is the lowest whole-number coefficient of C2O4 2 when the following equation is completed and balanced? A. 1 B. 2 C. 3 D. 4 E. 6 Cr2O7 2 + C2O4 2 Cr 3+ + CO2 (acidic solution) 18. Calculate G 0 for the following reaction. A kj B kj C kj D kj E kj Ag + (aq) + Fe 2+ (aq) Ag(s) + Fe 3+ (aq) 19. Which of the following metals will not provide cathodic protection to prevent corrosion of iron? A. Zn B. Mg C. Cu D. Al E. Cr 20. Contact of a dental filling (containing dental amalgam) with aluminum foil causes a momentary sharp tooth pain. Dental amalgam is a mixture of Ag 2Hg 3, Ag 3Sn and Sn 8Hg. The standard reduction potentials for these are: E red (Hg 2 2+ /Ag 2Hg 3) = 0.85 V; E red (Sn 2+ /Ag 3Sn)= 0.05 V; E red (Sn 2+ /Sn 8Hg) = 0.13 V. Which of the following statements is false for this electrochemical reaction: A. aluminum acts as the cathode B. substances in the dental amalgam act as the cathode 2+ C. the most likely species to be reduced is Hg 2 D. aluminum will be oxidized E. none of the above is a false statement 21. What is the equilibrium constant (at 25 o C) for the following reaction? A. 1.9 x B. 2.1 x C. 1.8 x D. 1.1 x E. 9.8 x Zn(s) + Cu 2+ (aq) Zn 2+ (aq) + Cu(s) 22. What is the concentration of Zn2+(aq) when the cell based on the following reaction has a potential of 1.30 V at 25 C? A. 1.0 M B. 1.7 x M C. 4.4 x M D. 4.1 x 10 9 M E M Zn(s) + Cu2+(aq) (1.0 x 10 5 M) Zn2+(aq) (x M) + Cu(s) Go on to the last page
5 23. In the blast furnace production of iron from its ore, the purpose of adding carbon is A. 1 and 2 B. 2 and 3 C. 1 and 3 D. 2 only E. 3 only 1. to heat the furnace 2. to serve as a reducing agent 3. to remove silicate impurities as slag 24. The following aqueous reaction is important in the purification of silver: 4Ag(s) + 8CN (aq) + O 2(g) + 2H 2O(l) 4[Ag(CN) 2] (aq) + 4OH (aq) What is oxidized in this reaction? A. Ag(s) B. CN ( aq) C. O 2(g) D. H 2O(l) E. this is not a reduction-oxidation reaction END OF EXAM
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