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Difficulty: EasyDefinitions and Classical vs Modern Concepts of Redox

Match each redox process description on the left with its corresponding definition type on the right.

  • Addition of oxygen or removal of hydrogenClassical definition of oxidation
  • Gain of electrons or decrease in oxidation numberModern definition of reduction
  • Loss of electrons or increase in oxidation numberModern definition of oxidation
  • Removal of oxygen or addition of hydrogenClassical definition of reduction

Answer

Addition of oxygen or removal of hydrogen corresponds to Classical definition of oxidation; Gain of electrons or decrease in oxidation number corresponds to Modern definition of reduction; Loss of electrons or increase in oxidation number corresponds to Modern definition of oxidation; Removal of oxygen or addition of hydrogen corresponds to Classical definition of reduction.
Classical concepts define oxidation as gaining oxygen or losing hydrogen, and reduction as losing oxygen or gaining hydrogen. Modern electronic concepts define oxidation as losing electrons (increasing oxidation state) and reduction as gaining electrons (decreasing oxidation state).

Step-by-Step Solution

1
Analyze classical definitions of redox reactions.
Classical oxidation involves adding oxygen or removing hydrogen, while classical reduction involves removing oxygen or adding hydrogen.
Classical redox concepts were based historically on element transfer, mainly oxygen and hydrogen.
2
Analyze modern electronic definitions of redox reactions.
Modern oxidation involves losing electrons (increase in oxidation number), while modern reduction involves gaining electrons (decrease in oxidation number).
Modern redox concepts expand the definitions to apply universally via electron transfer and oxidation state changes.

Key Concept

Classical (oxygen/hydrogen transfer) vs. Modern (electron transfer/oxidation state) definitions of oxidation and reduction.
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Topics

Definitions and Classical vs Modern Concepts of Redox

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