112 Sp08 ex3 A - Chemistry 112 Exam III Form A April 8,...

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Chemistry 112 Name _______________________ Exam III Form A Section _______________________ April 8, 2008 IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 25 questions on this exam. Check that you have done all of the problems and filled in the first 25 bubbles on the scantron. The maximum score on this exam is 25 points. Your score will be reported in percent (max 100%). Exam policy Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing.
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CHEMISTRY 112 EXAM III Apr. 8, 2008 FORM A ------------------------------------------------------------------------------------------------------------ 1. The missing product from this reaction is 121 53 I 121 52 Te + __________ A. 4 2 He B. 0 -1 e C. 1 0 n D. 0 1 e E. 0 0 β ----------------------------------------------------------------------------------------------------------- 2. The boiling point of mercury (Hg) is 630 K at 1 atm. Calculate Δ S ° for the following process if Δ H ° for this process is 60.8 kJ/mol. Hg(l) Hg(g) A. 0.00 J/mol K B. +10.4 J/mol K C. –10.4 J/mol K D. +96.5 J/mol K E. –96.5 J/mol K ----------------------------------------------------------------------------------------------------------- 3. Positrons have a very short lifetime because: A. they spontaneously undergo alpha decay B. they react with electrons to produce two gamma rays C. they react immediately with negatively charged antimatter nuclei D. they spontaneously undergo beta decay E. they react with photons to produce electrons ------------------------------------------------------------------------------------------------------------ Go on to the next page
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------------------------------------------------------------------------------------------------------------ 4. The purpose of the salt bridge in an electrochemical cell is to __________. A. maintain electrical neutrality in the half-cells via migration of ions. B. provide a source of ions to react at the anode and cathode. C. provide oxygen to facilitate oxidation at the anode.
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This note was uploaded on 10/04/2011 for the course CHEM 437623 taught by Professor Sherylrummel during the Fall '10 term at Pennsylvania State University, University Park.

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112 Sp08 ex3 A - Chemistry 112 Exam III Form A April 8,...

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