Exhibit 17-2 The Following Question(s) Pertain to an Electrochemical System in Which

question 20

Multiple Choice

Exhibit 17-2
The following question(s) pertain to an electrochemical system in which a 1.5 V battery supplies a current of 0.5 amps for 18 hours to an iron electrode immersed in a solution of nickel nitrate.
Refer to Exhibit 17-2. If the iron electrode initially weighed 20.00 g, what is the mass after the flow of current is stopped?

• A) 34.79 g
• B) 34.07 g
• C) 49.57 g
• D) 5.22 g
• E) 5.93 g

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Definitions:

Confound

A variable other than the one intended to be manipulated by the experimenter that may be responsible for the effect on the dependent variable, making alternative explanations possible.

Clowns

Entertainers who perform comical acts, using makeup and exaggerated expressions to amuse an audience; traditionally associated with circuses, parties, and theatrical performances.

Operational Definition

A specific, concrete method of measuring or manipulating a conceptual variable.

Ethical Issue

A situation that requires a person or organization to choose between alternatives that must be evaluated as right (ethical) or wrong (unethical).