CHEM
Chem 401 Unit 4 Exam S16 A

Name id a 6 matching 2 pt each a common dry cell c

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Name: ________________________ ID: A 6 Matching (2 pt each) a. common dry cell c. lead storage battery b. lithium ion battery d. fuel cell ____ 25. uses sulfuric acid as the electrolyte ____ 26. uses zinc case as one of its electrodes ____ 27. is commonly used in electronics ____ 28. produces water a product Short Answer Complete and balance the following equation(s). Fill in the missing Term and specify the mode of decay. 29. 36 85 Kr __________ + 1 0 (4 pts) Mode:___________________________ (3 pts) 30. 13 26 Al + 1 0 e 0 0 + __________ (4 pts) Mode: ______________________________ (3 pts) . 31. The alpha emission by lead-204 results in the product isotope __________. (4 pts) . 32. Write the symbol for the isotope that contains 14 protons and 15 neutrons. (4pts) __________ 33. Write the cell shorthand notation for the voltaic cell that utilizes the following half reactions: Al Al 3+ + 3e - E = -1.66V Cu Cu 2+ + 2e - E = 0.337V Assume that all concentrations are 1/10 that of standard conditions. (5 pts) ___________________________________________________________________________
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Name: ________________________ ID: A 7 34. Based on the following reactions (or lack there of) place the following 4 elements in an activity series with the most active at the top and the least active at the bottom (the same way we did in discussion). (5 pts) 3 Ni 2+ (aq) + 2 Cr(s) 3 Ni(s) + 2 Cr 3+ (aq) Ni 2+ (aq) + Bi(s) No Rxn Zn(s) + Ni 2+ (aq) Zn 2+ (aq) + Ni(s) Zn 2+ (aq) + Cr(s) No Rxn Most active _____ _____ _____ least active _____ . 35. Balance the following net ionic equation in basic solution . MnO 4 - + NH 3 NO 3 - + MnO 2 a) The number of electrons transferred is: ________ (3 pts) b) The total of all of the coefficients of the balanced reaction is: _______ (5 pts) You must show work that supports your answer to get ANY credit, but partial credit will most likely not be given!!! .
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Name: ________________________ ID: A 8 36. Find the cell potential for the following at 45 C. (8 ps) Al(s) | Al 3+ (0.010 M) || Fe 2+ (0.1 M) | Fe(s) Al 3+ + 3e- Al E = -1.660volt Fe 2+ + 2e- Fe E = -0.409volt . 37. Extra Credit: A rock contains 3.008 mg of 238 U and 0.624 mg of 206 Pb. The half-life of 238 U is 4.51 10 9 years. Estimate the age of the rock. (8 pts) .
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