It is impossible to measure the actual voltage of any half- cell by itself because:
Correct answer: C. A reaction does not take place on its own
- A. Both half-cell reactions take place simultaneously
- B. Of the resistance of the wire
- C. A reaction does not take place on its own
- D. None of the above
Explanation
A half-cell reaction represents either oxidation or reduction, but not both. For a potential difference to exist and be measured, there must be a complete circuit allowing for a flow of electrons, which requires both an oxidation and a reduction half-reaction to occur simultaneously.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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