midterm2_sp06

midterm2_sp06 - 1. [7 points] Which substance is the...

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1. [7 points] Which substance is the reducing agent in the following reaction? Fe 2 S 3 + 12HNO 3 2Fe(NO 3 ) 3 + 3S + 6NO 2 + 6H 2 O a. HNO 3 b. S c. NO 2 d. Fe 2 S 3 e. H 2 O 2. [7 points] What is the oxidation number of manganese in potassium permanganate, KMnO 4 ? (a) +1 (b) +2 (c) +5 (d) +4 (e) +7 3. [7 points] What is the coefficient of Fe 3+ , when the following redox equation is balanced in basic solution ? CN - + Fe 3+ CNO - + Fe 2+ a. 1 b. 2 c. 3 d. 4 e. 5 4. [7 points] What are the coefficients of H 2 S and H 2 O, when the following redox equation is balanced in acidic solution ? MnO 4 - + H 2 S S + Mn 2+ + H 2 O a. 5, 8 b. 5, 10 c. 2, 4 d. 2, 6 e. 3, 8 5. [7 points] In a voltaic cell, electrons flow from ________________ . a. The salt bridge to the anode b. The anode to the salt bridge c. The cathode to the anode d. The salt bridge to the cathode
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e. The anode to the cathode 6. [7 points] Which one of the following substances would you expect to be the best oxidizing agent? a. H 2 b. Na c. Cl 2 d. Li e. Ca 7. [7 points] Which of the following reactions will occur spontaneously as written (standard reduction potentials are given on the back page)? a. Sn 4+ (aq) + Fe 3+ (aq) Sn 2+ (aq) + Fe 2+ (aq) b. 3Fe (s) + 2Cr 3+ (aq) 2Cr (s) + 3Fe 2+ (aq) c. Sn 4+ (aq) + Fe 2+ (aq) Sn 2+ (aq) + Fe (s) d. 3Sn 4+ (aq) + 2Cr (s) 2Cr 3+ (aq) + 3Sn 2+ (aq) e. 3Fe 2+ (aq) Fe (s) + 2Fe 3+ (aq) 8. [7 points] Consider a voltaic cell where one half of the cell contains ZnCl 2 (aq) in contact with a Zn electrode, while the other half of the cell contains FeCl 2 (aq) in contact with a Fe electrode. Which electrode is the cathode and what is the standard cell potential, Eº cell ? a.
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midterm2_sp06 - 1. [7 points] Which substance is the...

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