electro homework2

electro homework2 - Dr. Rogers Electrochemistry Homework 1....

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Dr. Rogers Electrochemistry Homework 1. Manganese has the oxidation number of +5 in (A) [MnF 6 ] 3– (C) [MnO 4 ] 2– (B) Mn 2 O 7 (D) [Mn(CN) 6 ] 2. Fe (s) + Cu 2+ (aq) Cu (s) + Fe 2+ (aq) Identify the species oxidized, the species reduced, the oxidizing agent, and the reducing agent in this reaction. 3. Which is the strongest oxidizing agent? Standard Oxidation Potentials E 0 Na Na+ + e 2.71 V Cd Cd2+ + 2 e 0.40 V H 2 2H+ + 2 e 0.00 V Ag Ag+ + e –0.80 V 4. An oxidizing agent, when involved in a redox reaction, (A) is always reduced. (B) always contains oxygen. (C) always gives off electrons. (D) is always a metal. (E) is called a catalyst. 5. Which is true of the equation? 8KI + 9H 2 SO 4 4I 2 + 8KHSO 4 + H 2 S + 4H 2 O (A) The reducing agent is H 2 S. (B) The oxidizing agent is KI. (C) The substance reduced is H 2 SO 4 . (D) The substance oxidized is KHSO 4 . (E) This is not an oxidation–reduction equation. 6. The equation representing the anode half-reaction for the electrolysis of aqueous HCl is (A) Cl 2 (g) 2Cl (aq) + 2 e (B) 2Cl (aq) Cl 2 (g) + 2 e (C) 2HCl (aq) Cl 2 (g) + H 2 (g) (D) O 2 (g) + 4H + (aq) + 4 e 2H 2 O (l) 1
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7. When this half-reaction is balanced, H 2 O + Cl ClO 2 + H + + e the coefficient for the number of electrons is (A) 1 (B) 2 (C) 3 (D) 4 8. Balance this equation in basic conditions. Fe 2+ + MnO 4 + H 2 O Fe 3+ + MnO 2 + OH 9. Balance the equation for this reaction carried out in a basic solution: H 2 O + CrO 4 2– + HSnO 2 HSnO 3 + CrO 2 + OH 10. Balance the equation for this reaction in acidic conditions. Cr 2 O 7 2– + HSO 3 + H + Cr 3+ + SO 4 2– + H 2 O 11. Which reaction is spontaneous in the direction written? Use Appendix F. (A) 2Ag + Cu 2+ Cu + 2Ag + (B) Fe + Zn 2+ Fe 2+ + Zn (C) 2Al + 3Mg 2+ 2Al 3+ + 3Mg (D) 2Al + 3Zn 2+ 2Al 3+ + 3Zn 12. In every electrolytic and galvanic (voltaic) cell the anode is that electrode (A) at which oxidation occurs. (B)
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This note was uploaded on 10/28/2010 for the course CHAP 12 taught by Professor Lebec during the Spring '10 term at Marlboro.

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electro homework2 - Dr. Rogers Electrochemistry Homework 1....

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