Number of electron added on both sides of oxidation and reduction half reactions are balanced:
Correct answer: D. Before Adding two half reactions
- A. At the start of procedure
- B. Somewhere in the middle of balancing
- C. After Adding two half reactions
- D. Before Adding two half reactions
Explanation
For the reduction half, there are 12 positive charges on the left side of the equation and 6 positive charges on the right side of the equation. Therefore, we need to add 6 more electrons on the left side of the equation to balance the reduction half.
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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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