Oxidation & Reduction in Chemistry: Definitions, Examples, and Redox Reactions

What is oxidation in terms of electron transfer?

Oxidation is the loss of electrons.

What does oxidation refer to in terms of oxygen?

Oxidation refers to the addition of oxygen to a substance.

What is the classical type of oxidation involving rusting?

The combination of iron with oxygen to form iron oxide (rust).

Provide an example of a substance oxidized by gaining oxygen.

Carbon (C) is oxidized to form carbon dioxide (CO₂) when it combines with oxygen.

What happens during the removal of hydrogen in oxidation?

A molecule loses hydrogen atoms, such as ethanol losing hydrogen to become acetaldehyde.

What is reduction in terms of electron transfer?

Reduction is the gain of electrons.

What does reduction refer to in terms of oxygen?

Reduction refers to the removal of oxygen from a substance.

Provide an example of a substance reduced by losing oxygen.

Copper(II) oxide (CuO) is reduced to copper metal (Cu) by losing oxygen.

What occurs during the addition of hydrogen in reduction?

A molecule gains hydrogen atoms, such as acetaldehyde gaining hydrogen to become ethanol.

What is a redox reaction?

A redox reaction is a chemical reaction where oxidation and reduction occur simultaneously.

What is the role of an oxidizing agent in a redox reaction?

The oxidizing agent is the substance that gains electrons and is reduced.

What is the role of a reducing agent in a redox reaction?

The reducing agent is the substance that loses electrons and is oxidized.

What is the oxidation half-reaction for zinc in the reaction with copper(II) sulfate?

Zn → Zn²⁺ + 2e⁻

What is the reduction half-reaction for copper(II) sulfate in the reaction with zinc?

Cu²⁺ + 2e⁻ → Cu

What is the overall redox reaction between zinc and copper(II) sulfate?

Zn + Cu²⁺ → Zn²⁺ + Cu

What is the oxidation half-reaction for copper in the reaction with oxygen?

Cu → Cu²⁺ + 2e⁻

What is the reduction half-reaction for oxygen in the reaction with copper?

O₂ + 4e⁻ → 2O²⁻

What is the overall redox reaction for the formation of copper(II) oxide?

2Cu + O₂ → 2CuO

What is the significance of the number of electrons lost and gained in a redox reaction?

The number of electrons lost must equal the number of electrons gained.

What happens to metals during oxidation and reduction?

Metals lose electrons to form positive ions and are oxidized.

What happens to non-metals during oxidation and reduction?

Non-metals gain electrons to form negative ions and are reduced.

What is an example of oxidation in everyday life?

Rusting of iron.

What is an example of reduction in everyday life?

The conversion of copper(II) oxide to copper metal.