Using the Reduction Half-Reactions,write an Overall Reaction in the Direction

question 4

Multiple Choice

Using the reduction half-reactions,write an overall reaction in the direction that it is spontaneous.Calculate E°. $\begin{array}{l}\mathrm{MnO}_{4}-(a q) +8 \mathrm{H}^{+}(a q) +5 e^{-} \rightarrow 2 \mathrm{Mn}^{2+}(a q) +4 \mathrm{H}_{2} \mathrm{O}(l) & E_{\text {red }}^{\circ}=+1.512 \mathrm{~V}\\\mathrm{Fe}^{3+}(a q) +e^{-} \rightarrow \mathrm{Fe}^{2+}(a q) &E_{\mathrm{red}}^{\circ}=+0.769 \mathrm{~V}\end{array}$

• A) 5Fe³⁺(aq)+ Mn²⁺(aq)+ 4H₂O(l)? 5Fe²⁺(aq)+ MnO₄?(aq)+ 8H⁺(aq)E° = +2.333 V
• B) 5Fe²⁺(aq)+ Mn²⁺(aq)+ 4H₂O(l)? 5Fe³⁺(aq)+ MnO₄?(aq)+ 8H⁺(aq)E° = ?0.743 V
• C) MnO₄?(aq)+ 5Fe²⁺(aq)? Mn²⁺(aq)+ 5Fe³⁺(aq)E° = ?2.281 V
• D) MnO₄?(aq)+ 8H⁺(aq)+ 5Fe²⁺(aq)? Mn²⁺(aq)+ 5Fe³⁺(aq)+ 4H₂O(l)E° = +0.743 V
• E) MnO₄?(aq)+ 8H⁺(aq)+ 5Fe³⁺(aq)? Mn²⁺(aq)+ 5Fe²⁺(aq)+ 4H₂O(l)E° = +2.281 V

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Definitions:

Rods

Cells in the retina known as photoreceptors are crucial for enabling vision in dimly lit environments.

Night Vision

The ability to see in low light conditions, often enhanced by technological means in humans but naturally occurring in certain animal species.

Color

A characteristic of visual perception described through categories such as hue, saturation, and brightness, which results from the way an object reflects or emits light.

Fovea

A small, central pit in the retina of the eye responsible for sharp central vision, essential for activities where visual detail is of primary importance, like reading and driving.