Chapter 18 TAVSS

Chapter 18 TAVSS - CHAPTER 18 ELECTROCHEMISTRY...

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CHAPTER 18 ELECTROCHEMISTRY OXIDATION-REDUCTION REACTION CONCEPTS OXIDATION-REDUCTION REACTION CALCULATIONS GALVANIC CELLS & REDUCTION-POTENTIAL CONCEPTS REDUCTION POTENTIAL CALCULATIONS FREE ENERGY AND CELL POTENTIAL CALCULATIONS/NERNST EQUATION ELECTROLYSIS ELECTRIC WORK/AMPERES BATTERIES AND CORROSION Chapter 18 practice problems 1
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OXIDATION-REDUCTION REACTION CONCEPTS 22 . Chem 162-2004 Exam III Chapter 17 - Electrochemistry Oxidation-reduction concepts ET: Balancing reactions When the following skeleton equation is balanced in an acidic medium, the coefficient of the chloride ion will be: Cr 2 O 7 2- + Cl - Cr 3+ + Cl 2 A . 6 B. 5 C. 4 D. 3 E. 2 Cr 2 O 7 2- Cr 3+ Cr 2 O 7 2- 2Cr 3+ Cr 2 O 7 2- 2Cr 3+ + 7H 2 O Cr 2 O 7 2- + 14H + 2Cr 3+ + 7H 2 O Cr 2 O 7 2- + 14H + + 6e - 2Cr 3+ + 7H 2 O Cl - Cl 2 2Cl - Cl 2 2Cl - Cl 2 + 2e - Cr 2 O 7 2- + 14H + + 6e - 2Cr 3+ + 7H 2 O 3(2Cl - Cl 2 + 2e - ) Cr 2 O 7 2- + 6Cl - + 14H + 2Cr 3+ + 7H 2 O + 3Cl 2 Chapter 18 practice problems 2
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OXIDATION-REDUCTION REACTION CALCULATIONS 4.63 CHEM 162-2003 9 TH WEEK RECITATION ELECTROCHEMISTRY OXIDATION-REDUCTION REACTION CALCULATIONS Balance the following oxidation-reduction reactions that occur in acidic solution. a. Zn(s) + H + (aq) Zn 2+ (aq) + H 2 (g) Zn Zn 2+ + 2e - 2H + + 2e - H 2 Zn + 2H + Zn 2+ + H 2 e. CH 3 OH(aq) + Cr 2 O 7 2- (aq) CH 2 O(aq) + Cr 3+ (aq) 3(CH 3 OH(aq) CH 2 O(aq) + 2H + + 2e - ) Cr 2 O 7 2- (aq) + 14H + +6e - 2Cr 3+ (aq) + 7H 2 O 3CH 3 OH(aq) + Cr 2 O 7 2- (aq) +8H + 3CH 2 O(aq) + 2Cr 3+ (aq) + 7H 2 O Chapter 18 practice problems 3
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35. CHEM 162-2000 FINAL EXAM ELECTROCHEMISTRY OXIDATION-REDUCTION REACTION CALCULATIONS Consider the skeleton equation: Cr 2 O 7 2- (aq) + NO 2 (g) ® Cr 3+ (aq) + NO 3 - (aq) When this equation is balanced in acidic solution with the smallest possible integer coefficients, the coefficient of NO 2 (g) is A. 2 B. 4 C . 6 D. 8 E. 10 Cr 2 O 7 2- ®h Cr 3+ Cr 2 O 7 2- ®h 2Cr 3+ Cr 2 O 7 2- ®h 2Cr 3+ + 7H2O Cr 2 O 7 2- + 14H + ®h 2Cr 3+ + 7H2O Cr 2 O 7 2- + 14H + +6e - h ®h 2Cr 3+ + 7H2O NO 2 ®h NO 3 - NO 2 + H 2 O ®h NO 3 - NO 2 + H 2 O ®h NO 3 - + 2H + NO 2 + H 2 O ®h NO 3 - + 2H + + 1e - Cr 2 O 7 2- + 14H + +6e - h ®h 2Cr 3+ + 7H 2 O 6(NO 2 + H 2 O ® h NO 3 - + 2H + + 1e - ) Cr 2 O 7 2- + 14H + +6e - + 6NO 2 + 6H 2 O ®h 2Cr 3+ + 7H 2 O + 6NO 3 - + 12H + + 6e - Cr 2 O 7 2- + 2H + + 6NO 2 ®h 2Cr 3+ + H 2 O + 6NO 3 - C Chapter 18 practice problems 4
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18. CHEM 162-2000 HOURLY EXAM III ELECTROCHEMISTRY OXIDATION-REDUCTION REACTION CALCULATIONS In acidic, aqueous solution, the permanganate ion, MnO 4 - , reacts with the chloride ion, Cl - , to form Mn 2+ and Cl 2 (g). When the equation is balanced in lowest integral terms, what is the coefficient of H + (aq) in the net ionic equation? A. 4 B . 16 C. 10 D. 14 E. 5 21. CHEM 162-2001 HOURLY EXAM III ELECTROCHEMISTRY OXIDATION-REDUCTION REACTION CALCULATIONS In concentrated solutions of nitric acid, zinc metal reacts with NO 3 - to produce NH 4 + and Zn 2+ . In the balanced net ionic equation for this reaction, what is the stoichiometric coefficient of Zn(s)?
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This note was uploaded on 09/23/2011 for the course CHEMISTRY 101 taught by Professor Rabeony during the Fall '08 term at Rutgers.

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Chapter 18 TAVSS - CHAPTER 18 ELECTROCHEMISTRY...

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