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Ch.19 - Electrochemistry
McMurry - Chemistry 8th Edition
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모든 교과서McMurry 8th EditionCh.19 - Electrochemistry문제 43a
19장, 문제 43a

Classify each of the following unbalanced half-reactions as either an oxidation or a reduction. (a) O2(g) → OH-(aq)

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1
Identify the oxidation states of the elements in the reactants and products. For O2(g), the oxidation state of oxygen is 0. In OH-(aq), the oxidation state of oxygen is -2.
Determine the change in oxidation state for oxygen. The oxidation state changes from 0 in O2(g) to -2 in OH-(aq).
Recognize that a decrease in oxidation state indicates a gain of electrons, which is characteristic of a reduction process.
Conclude that the half-reaction O2(g) → OH-(aq) is a reduction because oxygen is gaining electrons.
Remember that in a reduction half-reaction, the species undergoing reduction is the one that gains electrons.

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주요 개념

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Oxidation and Reduction

Oxidation and reduction are chemical processes that involve the transfer of electrons between species. Oxidation refers to the loss of electrons, resulting in an increase in oxidation state, while reduction involves the gain of electrons, leading to a decrease in oxidation state. These processes are always coupled, meaning that when one species is oxidized, another must be reduced.
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가이드 코스
01:53
Oxidation and Reduction Reactions

Half-Reactions

Half-reactions are equations that show either the oxidation or reduction process separately, allowing for a clearer understanding of electron transfer. In a half-reaction, the species being oxidized or reduced is explicitly shown along with the electrons involved. This method is particularly useful in balancing redox reactions and identifying the roles of different reactants.
추천 영상:
가이드 코스
01:49
First-Order Half-Life

Oxidation States

Oxidation states (or numbers) are a way to keep track of electrons in chemical reactions, particularly in redox processes. Each element in a compound is assigned an oxidation state based on its electron configuration and bonding. Changes in oxidation states during a reaction help determine which species is oxidized and which is reduced, providing insight into the overall reaction mechanism.
추천 영상:
가이드 코스
02:42
Oxidation Numbers
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