Multiple Choice
In the reaction 4Li(s) + O2(g) → 2Li2O(s), identify the oxidizing agent and the reducing agent.
6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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In a redox reaction, what happens to a substance when it becomes oxidized, and what happens when it is reduced?
A
It loses electrons when oxidized and gains electrons when reduced.
B
It gains protons when oxidized and loses protons when reduced.
C
It gains electrons when oxidized and loses electrons when reduced.
D
It loses protons when oxidized and gains protons when reduced.
Verified step by step guidance1
Understand the concept of a redox reaction: Redox reactions involve the transfer of electrons between two substances. The term 'redox' is a combination of 'reduction' and 'oxidation'.
Define oxidation and reduction: Oxidation is the process where a substance loses electrons, while reduction is the process where a substance gains electrons.
Identify the role of electrons: In a redox reaction, the substance that loses electrons is said to be oxidized, and the substance that gains electrons is said to be reduced.
Clarify the misconception about protons: Redox reactions primarily involve the transfer of electrons, not protons. Therefore, changes in protons are not relevant to the definition of oxidation and reduction.
Summarize the correct understanding: In a redox reaction, a substance is oxidized when it loses electrons and reduced when it gains electrons. This is the fundamental principle of redox chemistry.
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