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Difficulty: EasyDefinitions and Classical vs Modern Concepts of Redox

Match each redox description on the left with its corresponding classical or modern definition concept on the right.

  • Addition of oxygen to a substanceClassical oxidation
  • Loss of electrons by a chemical speciesModern oxidation (electron transfer)
  • Decrease in the oxidation state of an elementModern reduction (oxidation state change)
  • Removal of oxygen from a compoundClassical reduction

Answer

Addition of oxygen matches Classical oxidation; Loss of electrons matches Modern oxidation (electron transfer); Decrease in oxidation state matches Modern reduction (oxidation state change); Removal of oxygen matches Classical reduction.
Classical oxidation involves gaining oxygen, while classical reduction involves losing oxygen. In modern electronic terms, oxidation is the loss of electrons (OIL), and reduction is a decrease in oxidation state (reduction of oxidation number).

Step-by-Step Solution

1
Identify classical redox concepts based on oxygen transfer.
Addition of oxygen corresponds to classical oxidation, whereas removal of oxygen corresponds to classical reduction.
Classical definitions focused on the transfer of oxygen and hydrogen atoms.
2
Identify modern redox concepts based on electron transfer and oxidation numbers.
Loss of electrons corresponds to modern oxidation, and a decrease in oxidation state corresponds to modern reduction.
Modern concepts expand redox beyond oxygen/hydrogen to include electron movement and formal charge changes.

Key Concept

Distinguishing between classical (oxygen/hydrogen transfer) and modern (electron transfer and oxidation number) definitions of oxidation and reduction.
Estimated Time:1m 0s
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Topics

Definitions and Classical vs Modern Concepts of Redox

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