4.1.3 Oxidation and reduction in terms of electrons

• Oxidation is the loss of electrons
• Match the characteristic with the correct process:

  Loss of electrons ↔️ Oxidation

  Gain of electrons ↔️ Reduction
• Oxidation and reduction always occur simultaneously in redox reactions.


  True
• Reduction decreases the oxidation state of a substance.

  True
• During oxidation, the oxidation state of a substance increases
• In reduction, the oxidation state of a substance decreases
• During oxidation, a substance loses electrons and its oxidation state increases.


  True
• In the redox reaction Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂, copper is oxidized
• Match the redox process with its corresponding half-equation:

  Oxidation ↔️ Fe²⁺ → Fe³⁺ + e^-

  Reduction ↔️ MnO₄^- + 8H⁺ + 5e^- → Mn²⁺ + 4H₂O
• Oxidation and reduction are essential for reactions such as combustion, corrosion, and electrochemical processes
• The OIL RIG mnemonic clarifies that oxidation involves the loss of electrons.

  True
• Reduction is the gain of electrons by a substance.


  True
• The mnemonic OIL RIG stands for Oxidation Is Loss, Reduction Is Gain
• In the example reaction Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂, copper is oxidized
• What happens to a substance when it loses electrons in an oxidation reaction?

  It is oxidized
• Redox reactions involve both oxidation and reduction processes simultaneously.


  True
• What is reduction defined in terms of electrons?

  Gain of electrons
• Use the OIL RIG mnemonic to describe the electron transfer processes in redox reactions.

  1️⃣ Oxidation Is Loss of electrons

  2️⃣ Reduction Is Gain of electrons
• What is the oxidation process in a redox reaction?

  Loss of electrons
• In the redox reaction Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂, silver ions (Ag⁺) gain electrons and are reduced.


  True
• Why are oxidation and reduction fundamental in chemistry?

  Essential for electron transfer
• Match the reaction type with its redox process:

  Combustion ↔️ Oxidation

  Corrosion ↔️ Reduction

  Batteries ↔️ Redox