Chem100A_Exp4_Electrochem&VitaminC_Quiz_20110420-KEY

Chem100A_Exp4_Electrochem&VitaminC_Quiz_20110420-KEY...

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Spring 2011 Student ID:_______________________________ Experiment 4: Electrochemistry and Vitamin C Quiz #3 (20 points)–April 20, 2011 1. (4 points) Give the following items Zn(s), Zn(NO 3 ) 2 (aq), Cr(s) and Cr(NO 3 ) 3 (aq) a. Construct a Daniell cell by writing a one-line description of the cell. b. From standard reduction potential table: Write a balanced cell reation. c. Which metal is the anode and which is the cathode? d. What direction does the electrons flow? 2. (4 points) What is the electrochemical potenital of the following reaction given that [Zn 2+ ] = 0.1M and [Cu 2+ ]= 0.01M? Given that T =298.25°K and standard electrochemical potenital is +1.103V. Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s) 3. (4 points) Suppose the label on the Vitamin C bottle shows that the nominal mass of vitamin C is 500mg and the tablet weighs 2.0 grams. a. When the tablet is pulverized in a clean mortar, what is the estimated mass of the powder that should be used so that it has the equivalent to a nomial mass of 100mg of vitamin C? b.
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Chem100A_Exp4_Electrochem&VitaminC_Quiz_20110420-KEY...

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