The Final Step of the Purification of Copper Involves Electrorefining

question 10

Multiple Choice

The final step of the purification of copper involves electrorefining in which copper is separated from nickel and iron by being reduced at the cathode of a cell. Why are nickel and iron not reduced?

• A)Their reduction potentials are more positive than copper's.
• B)Their reduction potentials are more negative than copper's.
• C)They cannot be deposited on a copper electrode.
• D)Their reduction potentials are more negative than water's.
• E)Their reduction requires large overvoltages.

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Definitions:

Basic Approach

The fundamental strategy or method adopted in dealing with a problem or in understanding a concept.

Paradigm

A distinct set of concepts or thought patterns, including theories, research methods, postulates, and standards for what constitutes legitimate contributions to a field.

Limit Inquiry

A process of setting boundaries around the scope of an investigation to focus on specific variables or contexts.

Psychoanalytic Approach

A method in psychology which posits that human behavior is the result of interactions among various unconscious psychological processes.