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Ch.20 - Electrochemistry
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 14th EditionCh.20 - Electrochemistry문제 14
20장, 문제 14

(a) What is meant by the term reduction? (b) On which side of a reduction half-reaction do the electrons appear? (c) What is meant by the term reductant? (d) What is meant by the term reducing agent?

검증된 단계별 안내
1
Reduction is a chemical reaction that involves the gain of electrons by a molecule, atom, or ion. It is one half of a redox (reduction-oxidation) reaction, where the other half is oxidation, which involves the loss of electrons.
In a reduction half-reaction, electrons appear on the reactant side (left side) of the equation. This is because the species undergoing reduction is gaining electrons.
A reductant, also known as a reducing agent, is a substance that donates electrons to another species in a chemical reaction. By donating electrons, the reductant itself becomes oxidized.
The term 'reducing agent' is synonymous with 'reductant.' It refers to the substance that causes another substance to be reduced by donating electrons to it. In the process, the reducing agent is oxidized.
In summary, reduction involves gaining electrons, and the reducing agent is the species that provides these electrons, thus undergoing oxidation itself.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Reduction

Reduction is a chemical process involving the gain of electrons by a substance. It is one half of a redox (reduction-oxidation) reaction, where one species is reduced while another is oxidized. In this context, the oxidation state of the reduced species decreases, indicating a transformation that often leads to the formation of more stable compounds.
추천 영상:
가이드 코스
01:10
Standard Reduction Potentials

Electrons in Reduction Half-Reaction

In a reduction half-reaction, electrons are added to the reactant, appearing on the left side of the equation. This signifies that the species is gaining electrons, which is essential for understanding how reduction occurs in redox reactions. For example, in the reduction of copper ions to copper metal, electrons are shown as reactants.
추천 영상:
가이드 코스
01:53
Oxidation and Reduction Reactions

Reducant and Reducing Agent

A reductant, or reducing agent, is a substance that donates electrons in a chemical reaction, causing another substance to be reduced. It undergoes oxidation itself in the process. Understanding the role of the reducing agent is crucial in redox chemistry, as it helps identify which species facilitates the reduction of another.
추천 영상:
가이드 코스
01:01
Oxidizing and Reducing Agents
관련 실천
교과서 질문

Indicate whether each of the following statements is true or false: (a) If something is oxidized, it is formally losing electrons.

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교과서 질문

Indicate whether each of the following statements is true or false: (c) If there are no changes in the oxidation state of the reactants or products of a particular reaction, that reaction is not a redox reaction.

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교과서 질문

Indicate whether each of the following statements is true or false: (b) For the reaction Fe3+(aq) + Co2+(aq) → Fe2+(aq) + Co3+(aq), Fe3+(aq) is the reducing agent and Co2+(aq) is the oxidizing agent.

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교과서 질문

Magnesium, the element, is produced commercially by electrolysis from a molten salt (the 'electrolyte') using a cell similar to the one shown here. (c) Recall that in an electrolytic cell the anode is given the + sign and the cathode is given the – sign, which is the opposite of what we see in batteries. What half-reaction occurs at the anode in this electrolytic cell?

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교과서 질문

(b) On which side of an oxidation half-reaction do the electrons appear?

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