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Questions and Answers
What does a positive standard electrode potential ($E^ullet$) indicate about a reaction?
What does a positive standard electrode potential ($E^ullet$) indicate about a reaction?
- The reverse reaction is spontaneous.
- The reaction is non-spontaneous.
- The reaction will not occur.
- The reaction is spontaneous in the written direction. (correct)
What occurs when the standard electrode potential ($E^ullet$) is negative?
What occurs when the standard electrode potential ($E^ullet$) is negative?
- The reaction proceeds in the written direction.
- The reaction is spontaneous.
- The reaction is non-spontaneous. (correct)
- The reverse reaction is non-spontaneous. (correct)
In the reaction $Ni(s) + Mn^{2+}(aq) \rightarrow Ni^{2+}(aq) + Mn(s)$, what is needed to determine if the reaction is spontaneous?
In the reaction $Ni(s) + Mn^{2+}(aq) \rightarrow Ni^{2+}(aq) + Mn(s)$, what is needed to determine if the reaction is spontaneous?
Standard electrode potential ($E^ullet$) values for the half-reactions.
A voltaic cell will proceed in the direction that results in a positive cell potential ($E_{cell}^ullet$), which indicates __________ reactions are favored.
A voltaic cell will proceed in the direction that results in a positive cell potential ($E_{cell}^ullet$), which indicates __________ reactions are favored.
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Study Notes
Determining Spontaneity of a Reaction
- Standard electrode potential ($E^\circ$) values can be used to predict whether a redox reaction will occur spontaneously.
- A voltaic cell will proceed in the direction that results in a positive cell potential ($E_{cell}^\circ$).
- If $E^\circ$ is positive, the reaction is spontaneous in the written direction.
- If $E^\circ$ is negative, the reaction is non-spontaneous in the written direction, and the reverse reaction is spontaneous.
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