2c practice key

2c practice key - Practice Midterm Exam #1 - Chem 2C (B)...

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Practice Midterm Exam #1 -- Chem 2C (B) Fall 2007 Name POTENTIALLY USEFUL INFORMATION and a PERIODIC CHART are given on the last two pages of this exam Problem (possible Points) Points 1-10 (40) 11 (12) 12 (8) 13 (20) 14 (20) TOTAL (100)
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Chem 2C(B) – Fall 07 2 Practice Midterm 1 Name 2 Each multiple choice question is worth 4 points. Circle the BEST answer. Only ONE answer will be graded--if two are circled--the answer will be counted as WRONG! 1. Consider the following reaction: Cd(s) + 2AgCl(s) ––> Cd 2+ (aq) + 2Ag(s) + 2Cl (aq) In this reaction, the reducing agent is (a) Cd(s) (b) AgCl(s) (c) Cd 2+ (d) Ag(s) (e) Cl (aq) 2. The equilibrium constant for the reaction 2Hg(l) + 2Cl (aq) + Ni 2+ (aq) Æ Ni(s) +Hg 2 Cl 2 (s) is 5.6 x 10 -20 at 25 ˚ C. Calculate E ˚ for a cell utilizing this reaction. (a) —0.25 V (b) +0.57 V (c) +1.14 V (d) —0.57 V (e) —1.14 V 3. The standard potential of the Ag + /Ag electrode is +0.80 V and the standard potential of the cell Fe(s)|Fe 2+ (aq) ||Ag + (aq)|Ag(s) is +1.24 V. What is the standard potential of the Fe 2+ /Fe electrode? (a) +0.44 V (b) +2.04 V (c) —0.88 V (d) —2.04 V (e) —0.44 V 4. Which species will reduce Cr 3+ but not Mn 2+ ? (a) In 2+ (b) Al (c) Fe (d) Zn (e) Sn
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Chem 2C(B) – Fall 07 3 Practice Midterm 1 Name 3 5. Given: SO 4 2— (aq) Æ H 2 SO 3 (aq), acidic solution. When this half-reaction is balanced, both H
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2c practice key - Practice Midterm Exam #1 - Chem 2C (B)...

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