Chm- Ch2-Redox Reaction- V1

Summary

In this lesson, students are introduced to redox reactions in electrochemistry. The video explains the concepts of oxidation (the loss of electrons) and reduction (the gain of electrons). Examples of these processes are illustrated with metals like silver and sodium. The relationship between oxidation and reduction is highlighted, emphasizing that they always occur together in a redox reaction. The lesson includes a mnemonic, OIL RIG, to help remember that 'Oxidation Is Loss' and 'Reduction Is Gain' of electrons. An application problem is provided for students to practice identifying oxidation and reduction half-reactions.

Takeaways

• 😀 Oxidation is the process where an atom loses electrons, resulting in a positively charged ion.
• 😀 Reduction is the process where an atom gains electrons, leading to the formation of an atom or negatively charged ion.
• 😀 Oxidation and reduction always occur together in a redox reaction, ensuring no net loss or gain of electrons overall.
• 😀 The acronym 'OIL RIG' helps remember redox reactions: Oxidation Is Loss, Reduction Is Gain of electrons.
• 😀 Metals like silver (Ag) and sodium (Na) undergo oxidation by losing electrons to form positive ions.
• 😀 A redox reaction consists of two parts: the oxidation half-reaction and the reduction half-reaction.
• 😀 The oxidation half-reaction involves an atom losing electrons, while the reduction half-reaction involves a cation or atom gaining electrons.
• 😀 In a redox reaction, for example, Cu loses two electrons to become Cu²⁺ (oxidation), and Cu²⁺ gains two electrons to form Cu (reduction).
• 😀 Example of oxidation: Cr loses three electrons to become Cr³⁺, while H⁺ gains an electron to become H (reduction).
• 😀 Your assignment is to rewatch the video and apply the concepts learned by identifying oxidation and reduction half-reactions in given chemical equations.

Q & A

What is the definition of oxidation in a redox reaction?

Oxidation is the process by which a chemical species loses one or more electrons.

What happens during reduction in a redox reaction?

Reduction is the process by which a chemical species gains one or more electrons.

What is an example of oxidation in a chemical reaction?

An example of oxidation is when a metal like silver (Ag) loses one electron to become Ag+.

What is an example of reduction in a chemical reaction?

An example of reduction is when a cation like Ag+ gains one electron to become Ag.

What is a redox reaction composed of?

A redox reaction is made up of two parts: the oxidation half-reaction and the reduction half-reaction.

What does the abbreviation OIL RIG stand for in redox reactions?

OIL RIG stands for 'Oxidation Is Loss, Reduction Is Gain' of electrons.

Why do oxidation and reduction always occur together in a redox reaction?

Oxidation and reduction occur together to ensure there is no net loss or gain of electrons overall.

What happens in the oxidation half-reaction example involving copper (Cu)?

In the oxidation half-reaction, copper (Cu) loses two electrons to become Cu2+.

What happens in the reduction half-reaction example involving copper (Cu)?

In the reduction half-reaction, Cu2+ gains two electrons to become copper (Cu).

In the given example, what is the oxidation process for chromium (Cr)?

Chromium (Cr) undergoes oxidation by losing three electrons to become Cr3+.