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Difficulty: EasyDefinitions and Classical vs Modern Concepts of Redox

Pair each of the chemical transformation descriptions listed on the left with its corresponding classical or modern redox definition concept on the right.

  • Loss of electrons by an atom or ion during a chemical reactionModern electronic concept of oxidation
  • Removal of hydrogen from a chemical compoundClassical concept of oxidation via hydrogen transfer
  • Decrease in the oxidation number of an elementModern oxidation-number concept of reduction
  • Addition of oxygen to an element or compoundClassical concept of oxidation via oxygen transfer

Answer

Loss of electrons corresponds to the modern electronic concept of oxidation; removal of hydrogen corresponds to the classical concept of oxidation via hydrogen transfer; decrease in oxidation number corresponds to the modern oxidation-number concept of reduction; addition of oxygen corresponds to the classical concept of oxidation via oxygen transfer.
The matching pairs correctly connect historical definitions (oxygen addition and hydrogen removal) and modern definitions (electron loss and oxidation number reduction) to their corresponding oxidation or reduction classifications.

Step-by-Step Solution

1
Differentiate classical definitions from modern redox concepts.
Classical concepts focus on oxygen and hydrogen transfer, whereas modern concepts focus on electron transfer and changes in oxidation state.
Historical definitions arose before the electron was discovered, while modern definitions generalize redox processes to all chemical species.
2
Match electron transfer and oxidation state statements.
Loss of electrons is modern oxidation, and a decrease in oxidation state is modern reduction.
Oxidation increases charge/oxidation state via electron loss; reduction decreases charge/oxidation state via electron gain.
3
Match hydrogen and oxygen transfer statements.
Removal of hydrogen is classical oxidation, and addition of oxygen is classical oxidation.
Classical oxidation is defined by adding oxygen or removing hydrogen from a substance.

Key Concept

Distinguishing classical (oxygen/hydrogen transfer) from modern (electron transfer / oxidation state) definitions of oxidation and reduction.
Estimated Time:45s
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Topics

Definitions and Classical vs Modern Concepts of Redox

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