C152MidtermII_2003__key - Chem 152 Midterm II Section Name...

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Page 1 Chem 152 Midterm II Section:______________ Name:_________________ You will have 50 minutes. Useful equations and other information is provided on the last page of this exam...feel free to remove this page if it is convenient. You do not need to turn it in with the exam. Question 1________________/40 Question 2________________/12 Question 3________________/18 Question 4________________/15 Question 5________________/15 Total____________________/100
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Page 2 1. Multiple Choice (4 pts. each): a. How many electrons are transferred in the following reaction: SO 3 2 ± ( aq ) ² MnO 4 ± ( aq ) o SO 4 2 ± ( aq ) ² Mn 2 ² ( aq ) A: 2 B: 4 C: 6 D : 10 b. The standard potential for the following reaction is 1.56 V: Zn ( s ) ² 2 Ag ² ( aq ) o Zn 2 ² ( aq ) ² 2 Ag ( s ) What is the standard potential for the following reaction: 2 Zn ( s ) ² 4 Ag ² ( aq ) o 2 Zn ² 2 ( aq ) ² 4 Ag ( s ) A: -3.12 V B : 1.56 V C: 3.12 V D: -1.56 V c. Using the tables of half-cell potentials provided, which of the following species is the best reducing agent? A: Br 2 B: H 2 C: Mg 2+ D : Mg d. The equilibrium constant (K) for the following reaction under standard conditions is approximately: 2 Al ( s ) ² 3 Cu 2 ² ( aq ) o 2 Al 3 ² ( aq ) ² 3 Cu ( s ) A : 10 203 B: 10 34 C: 10 68 D: 10 -68
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Page 3 e. The workfunction of potassium is 3.68 x 10 -19 J. This corresponds to which of the following wavelengths? A. 480 nm B . 540 nm C. 298 nm D. 320 nm f. For which element are the d orbitals completely filled in the neutral atom? A. K B. V C. Fe D . Br g. What is the total number of electrons that can be accommodated in all of the orbitals corresponding to n = 3?
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