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Difficulty: EasyDefinitions and Classical vs Modern Concepts of Redox

Match each redox concept on the left with its corresponding definition on the right.

  • Classical concept of oxidationAddition of oxygen or removal of hydrogen
  • Classical concept of reductionRemoval of oxygen or addition of hydrogen
  • Modern concept of oxidationLoss of electrons or increase in oxidation number
  • Modern concept of reductionGain of electrons or decrease in oxidation number

Answer

Classical oxidation corresponds to addition of oxygen or removal of hydrogen; classical reduction corresponds to removal of oxygen or addition of hydrogen; modern oxidation corresponds to loss of electrons or increase in oxidation number; modern reduction corresponds to gain of electrons or decrease in oxidation number.
Each concept correctly aligns with its historical or electronic definition: classical oxidation gains oxygen/loses hydrogen, classical reduction loses oxygen/gains hydrogen, modern oxidation loses electrons/increases oxidation state, and modern reduction gains electrons/decreases oxidation state.

Step-by-Step Solution

1
Identify the classical definitions of oxidation and reduction.
Classical oxidation involves adding oxygen or removing hydrogen. Classical reduction involves removing oxygen or adding hydrogen.
Classical chemistry based redox concepts strictly on the movement of oxygen and hydrogen atoms.
2
Identify the modern electronic definitions of oxidation and reduction.
Modern oxidation involves losing electrons or increasing oxidation number (OIL: Oxidation Is Loss). Modern reduction involves gaining electrons or decreasing oxidation number (RIG: Reduction Is Gain).
Modern chemistry expanded redox to include all electron transfer processes regardless of whether oxygen or hydrogen is present.
3
Match each left term to its exact definition on the right.
Classical oxidation -> Addition of oxygen or removal of hydrogen; Classical reduction -> Removal of oxygen or addition of hydrogen; Modern oxidation -> Loss of electrons or increase in oxidation number; Modern reduction -> Gain of electrons or decrease in oxidation number.
Aligning concepts with their foundational definitions ensures accurate distinction between classical and modern theories.

Key Concept

Classical vs Modern Concepts of Oxidation and Reduction
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Topics

Definitions and Classical vs Modern Concepts of Redox

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