178Exam3AKeyF06

178Exam3AKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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STACEY STOFFREGEN CHEM 178 NAME FALL 2006 HOUR EXAM 3 RECIT. INSTR. RECIT. SECT. THIS EXAM CONSISTS OF 13 QUESTIONS ON 6 PAGES SEAT # Teaching Assistants and Recitation Sections FINAL EXAM Name Section Time Monday December 11, 2006 Alex Blom 2,5 9:00, 10:00 Gilman 1002 7:30am-9:30am Sayantan Bose 3,9 9:00, 12:10 Beth Prince 1,4,6 8:00, 10:00, 11:00 Matthew Soyk 7,8 11:00, 12:10 PAGE POINTS SCORE 1 15 pts _________ 2 18 pts _________ 3 22 pts _________ 4 12 pts _________ 5 15 pts _________ 6 18 pts _________ TOTAL 100 pts _________ SHOW ALL OF YOUR WORK ON THESE EXAM PAGES. NUMERICAL ANSWERS SHOULD BE GIVEN IN THE CORRECT NUMBER OF SIGNIFICANT FIGURES AND UNITS. PUT YOUR ANSWERS IN THE ANSWER SPACES. THE LAST PAGE CONTAINS A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR REFERENCE AND SCRATCH PAPER. THIS IS A CLOSED-NOTE, CLOSED-BOOK EXAM. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #6 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE COURSE WEBSITE
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1 1a. (8pts) Nickel-cadmium batteries are used in cordless razors, photoflash units, and power tools. Balance the redox reaction below to provide the overall reaction occurring in the battery under basic conditions. Cd(s) + NiO(OH)(s) Cd(OH) 2 (s) + Ni(OH) 2 (s) Cd Cd(OH) 2 NiO(OH) Ni(OH) 2 2H 2 O + Cd Cd(OH) 2 NiO(OH) Ni(OH) 2 2H 2 O + Cd Cd(OH) 2 + 2H + H + + NiO(OH) Ni(OH) 2 2OH - + 2H 2 O + Cd Cd(OH) 2 + 2H + + 2OH - OH - + H + + NiO(OH) Ni(OH) 2 + OH - 2OH - + 2H 2 O + Cd Cd(OH) 2 + 2H + + 2OH - + 2e - 1e - + OH - + H + + NiO(OH) Ni(OH) 2 + OH - 2OH - + 2H 2 O + Cd Cd(OH) 2 + 2H + + 2OH - + 2e - 2 x (1e - + OH - + H + + NiO(OH) Ni(OH) 2 + OH - ) 2OH - + 2H 2 O + Cd Cd(OH) 2 + 2H + + 2OH - + 2e - 2e - + 2OH - + 2H + + 2NiO(OH) 2Ni(OH) 2 + 2OH - 2NiO(OH) + 2H 2 O + Cd Cd(OH) 2 + 2Ni(OH) 2 1b. (4pts) Nickel-cadmium batteries are rechargeable batteries. Briefly explain how batteries can be recharged. Batteries can be recharged by provided an external source of energy to reverse the overall cell reaction regenerating the starting materials. 2. (3pts)
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178Exam3AKeyF06 - STACEY STOFFREGEN FALL 2006 CHEM 178 HOUR...

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