69 Oxidation-Reduction Reactions
LumenLearning
Redox Reactions Introduction
LEARNING OBJECTIVES
Explain the processes involved in a redox reaction and describe what happens to their various components.
KEY TAKEAWAYS
Key Points
- Oxidation and reduction reactions are defined by the movement of electrons
Key Terms
- redox: a shorthand term for “reduction-oxidation,” two methods of electron transfer that always occur together
Redox reactions are all around us. In fact, much of our technology, from fire to laptop batteries, is largely based on redox reactions. Redox ( reduction – oxidation ) reactions are those in which the oxidation states of the reactants change. This occurs because in such reactions, electrons are always transferred between species. Redox reactions take place through either a simple process, such as the burning of carbon in oxygen to yield carbon dioxide ([latex]\text{CO}_2[/latex]), or a more complex process such as the oxidation of glucose ([latex]\text{C}_2\text{H}_12\text{O}_6[/latex]) in the human body through a series of electron transfer processes.
The term “redox” comes from two concepts involved with electron transfer: reduction and oxidation. These processes are defined as follows:
- Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
- Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
A simple mnemonic for remembering these processes is “OIL RIG”—Oxidation Is Losing (electrons), Reduction Is Gaining (electrons).
Redox reactions are matched sets: if one species is oxidized in a reaction, another must be reduced. Keep this in mind as we look at the five main types of redox reactions: combination, decomposition, displacement, combustion, and disproportion.
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- Curation and Revision. Provided by: Boundless.com. License: CC BY-SA: Attribution-ShareAlike
CC LICENSED CONTENT, SPECIFIC ATTRIBUTION
- reduction. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/reduction. License: CC BY-SA: Attribution-ShareAlike
- oxidation. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/oxidation. License: CC BY-SA: Attribution-ShareAlike
- Ionic Charges. Provided by: http://apchemcyhs.wikispaces.com/. Located at: http://www.chemprofessor.com/ptable4.gif. License: CC BY-SA: Attribution-ShareAlike
- Oxidation-reduction. Provided by: Wikipedia. Located at: http://en.wikipedia.org/wiki/Oxidation-reduction. License: CC BY-SA: Attribution-ShareAlike
- redox. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/redox. License: CC BY-SA: Attribution-ShareAlike
- Ionic Charges. Provided by: http://apchemcyhs.wikispaces.com/. Located at: http://www.chemprofessor.com/ptable4.gif. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Types of chemical reactions. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Types_of_chemical_reactions. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Redox Reactions/Oxidation and Reduction equations. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Redox_Reactions/Oxidation_and_Reduction_equations. License: CC BY-SA: Attribution-ShareAlike
- redox. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/redox. License: CC BY-SA: Attribution-ShareAlike
- reduction. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/reduction. License: CC BY-SA: Attribution-ShareAlike
- oxidation. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/oxidation. License: CC BY-SA: Attribution-ShareAlike
- Ionic Charges. Provided by: http://apchemcyhs.wikispaces.com/. Located at: http://www.chemprofessor.com/ptable4.gif. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Types of chemical reactions. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Types_of_chemical_reactions. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Redox Reactions/Oxidation and Reduction equations. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Redox_Reactions/Oxidation_and_Reduction_equations. License: CC BY-SA: Attribution-ShareAlike
- Boundless. Provided by: Boundless Learning. Located at: http://www.boundless.com//chemistry/definition/oxdizing-agent. License: CC BY-SA: Attribution-ShareAlike
- reducing agent. Provided by: Wiktionary. Located at: http://en.wiktionary.org/wiki/reducing_agent. License: CC BY-SA: Attribution-ShareAlike
- Ionic Charges. Provided by: http://apchemcyhs.wikispaces.com/. Located at: http://www.chemprofessor.com/ptable4.gif. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Types of chemical reactions. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Types_of_chemical_reactions. License: CC BY-SA: Attribution-ShareAlike
- General Chemistry/Redox Reactions/Oxidation and Reduction equations. Provided by: Wikibooks. Located at: http://en.wikibooks.org/wiki/General_Chemistry/Redox_Reactions/Oxidation_and_Reduction_equations. License: CC BY-SA: Attribution-ShareAlike
This chapter is an adaptation of the chapter “Oxidation-Reduction Reactions” in Boundless Chemistry by LumenLearning and is licensed under a CC BY-SA 4.0 license.
a shorthand term for “reduction-oxidation,” two methods of electron transfer that always occur together