Question

What is meant by a half-reaction?

   What is meant by a half-reaction?

Chemistry The Science in Context

Chemistry The Science in Context

Thomas R. Gilbert 5th Edition

Chapter 4, Problem 96

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Solved by Expert David Collins

05/11/2020

Step 1

An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Show more…

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What is meant by a half-reaction?

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Key Concepts

Half-Reaction

A half-reaction is an equation that represents either the oxidation or the reduction process in a redox reaction. Instead of showing the complete reaction, a half-reaction focuses solely on the electrons that are either lost or gained, providing clarity on the specific transformation occurring to a chemical species during the electron transfer process.

Redox Reaction

A redox reaction is a type of chemical reaction involving the transfer of electrons between two species. It comprises two complementary processes—oxidation, where a substance loses electrons, and reduction, where a substance gains electrons. By breaking down the overall reaction into half-reactions, the electron transfer steps become easier to balance and understand.

Oxidation

Oxidation is the part of a redox reaction where a chemical species loses electrons, often resulting in an increase in its oxidation state. It is typically represented by a half-reaction that explicitly shows the electrons being released, highlighting the component of the reaction responsible for electron donation.

Reduction

Reduction is the complementary process in a redox reaction where a chemical species gains electrons, leading to a decrease in its oxidation state. In its half-reaction form, the electrons that the substance accepts are clearly indicated, emphasizing its role as the electron acceptor in the reaction.

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