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Unformatted text preview: Chemistry 401 Exam III Name Prof. Alex Ishchuk Fall 2016 I. Multiple Choice (circle your answer) x-+-8+4= -1 X4 (8)= -2 1) What element is being oxidized in the following redox reaction? Cr(OH)4 (aq) + CIO-(aq) -> Cro4?-(aq) + CI-(aq) ceo -ee A) Cr 13 -8 4 B) O +1-2 9-8 - 1 C) H D) CI 2) Identify the characteristics of a spontaneous reaction. A) AGo < 0 B) AE cell > 0 C) K> 1 D) all of the above E) none of the above A) Zn 3) Which of the following metals will not dissolve in nitric acid or hydrochloric acid? B) Cu C) Ni D) Au E) all of the above 4) Determine the cell notation for the redox reaction given below. high activity 3 Cl2(g) + 2 Fe(s) -+ 6 CI-(aq) + 2 Fest(aq) A) Cl2(g) | CI- (aq) | Pt Il Fe(s) | Fe3+(aq) B) CI-(aq) | Cl2(g) | Pt |I Fest(aq) | Fe(s) C) Fest(aq) | Fe(s) |I CI-(aq) | Cl2(g) 1 Pt Fees, I Feltcagle-rapl Clzyl Ptisy D) Fe(s) | Cl2(g) II Fe3+faq) | CI-(aq) | Pt E) Fe(s) | Fest(aq) |I Cl2(g) | CI-(aq) | Pt -6) Which particle has the highest penetrating power? A) alpha particle Lweakest B) beta particle gamma particle strongest D) positron emission E) electron capture -6) Describe what changes occur during gamma ray emission. A) The mass number and atomic number decreases B) The mass number and atomic number increases. C) The mass number is unchanged and the atomic number decreases. D) The mass number is unchanged and the atomic number increases. E) The mass number and atomic number do not change. 7) The following reaction represents what nuclear process? 214 pb -> 82 Lye + 214 Bi 83 A) alpha emission B) gamma emission C) electron capture D) neutron bombardment E) beta emission 8) Determine the identity of the daughter nuclide from the electron capture by Rb. -7_e+ K A) / K B) o Sr 38 Br C) 35 D) 85 E) 2 9) What statement is NOT true about standard electrode potentials? A) E'cell is positive for spontaneous reactions/ B) Electrons will flow from more negative electrode to more positive electrode/ C) The electrode potential of the standard hydrogen electrode is exactly zero. DyEcell is the difference in voltage between the anode and the cathode. E) The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive Eo. .....b . . . 1... .....e...
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