5 Steps to a 5 AP Chemistry

 Free-Response Questions

First Free-Response Question

Answer the following question in 15 minutes. You may not use a calculator. You may use

the tables at the back of the book.

The above galvanic cell is constructed with a cobalt electrode in a 1.0 M Co(NO 3 ) 2 solu-

tion in the left compartment, and a silver electrode in a 1.0 M AgNO 3 solution in the right

compartment. The salt bridge contains a KNO 3 solution. The cell voltage is positive.

a. What is the balanced net ionic equation for the reaction, and what is the cell potential?

b. Which electrode is the anode? Justify your answer.

c. Could KCl be substituted for the KNO 3 in the salt bridge? Justify your answer.

d. If some solid Co(NO 3 ) 2 is added to the cobalt compartment, what will happen to the

voltage? Justify your answer.

e. If the cell is allowed to operate until equilibrium is established, what will the potential

be? Justify your answer.

Second Free-Response Question

You have 15 minutes to answer the following questions. You may not use a calculator. You

may use the tables in the back of the book.

Co e Co V

Ag+ e Ag V

(^22028)
1080
+−
−

→°=−

+→ °=+

E

E

.

.

V

V = voltmeter

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