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Energy-Yielding Redox Reactions and Gibbs Free Energy

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Energy-Yielding Redox Reactions and Gibbs Free Energy

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Questions and Answers

Which statement best describes the analogy used to explain energy-yielding redox reactions?

An electron donor is likened to an object at the bottom of a hill, which can gain energy as it moves to a higher energy state.

An electron acceptor is likened to an object at the top of a hill, which can release energy as it moves to a lower energy state.

An electron at a low energy state is likened to an object at the bottom of a hill, which can gain energy as it moves to a higher energy state.

An electron at a high energy state is likened to an object at the top of a hill, which can release energy as it moves to a lower energy state. (correct)

What is the role of the electron acceptor in an energy-yielding redox reaction?

It donates electrons to the electron donor, facilitating the release of energy.

It prevents the electron donor from releasing energy.

It provides energy for the electron donor to release electrons.

It accepts electrons from the electron donor, facilitating the release of energy. (correct)

What condition must be met for a redox reaction to release energy that can be harnessed by organisms?

The $\Delta G$ of the electron donation must be negative, and the $\Delta G$ of the electron acceptance must be positive.

The overall $\Delta G$ of the electron donation and acceptance must be positive.

The overall $\Delta G$ of the electron donation and acceptance must be negative. (correct)

The $\Delta G$ of the electron donation must be positive, and the $\Delta G$ of the electron acceptance must be negative.

How can the total energy yield of a redox reaction be determined?

By summing the $\Delta G$ values of the two half-reactions involved. Signup and view all the answers

In the example of aerobic respiration, which of the following statements is true?

The carbon in organic matter (CH2O) is oxidized, and oxygen is reduced. Signup and view all the answers

What is the net energy yield of aerobic respiration per mole of CH2O oxidized?

-494 kJ Signup and view all the answers

Which statement best summarizes the principle described in the text regarding energy yield in redox reactions?

Energy can be yielded even if one half-reaction requires energy input, as long as the overall reaction is energetically favorable. Signup and view all the answers

Which of the following statements is true regarding the principles described in the text?

The principles are applicable to a variety of electron donors and acceptors beyond the familiar carbon and oxygen used in aerobic respiration. Signup and view all the answers

Which of the following statements is true regarding the role of $\Delta G$ in redox reactions?

The $\Delta G$ value determines both the direction of the reaction and the energy yield. Signup and view all the answers