Formation Reaction Definition

One mole of product is made in a formation reaction.
One mole of product is made in a formation reaction. iStock Vectors, Getty Images
By
Anne Marie Helmenstine, Ph.D.
Chemistry Expert
  • Ph.D., Biomedical Sciences, University of Tennessee at Knoxville
  • B.A., Physics and Mathematics, Hastings College
Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.
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Anne Marie Helmenstine, Ph.D.
Updated July 08, 2019

A formation reaction is a reaction where the one mole of product is formed.

Formation Reaction Example

Hydrogen and oxygen combine to form water by the formula:
2 H2 + O2 → 2 H2O
The formation reaction of this process is:
H2 + ½ O2 → H2O

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Helmenstine, Anne Marie, Ph.D. "Formation Reaction Definition." ThoughtCo, Aug. 25, 2020, thoughtco.com/definition-of-formation-reaction-605143. Helmenstine, Anne Marie, Ph.D. (2020, August 25). Formation Reaction Definition. Retrieved from https://www.thoughtco.com/definition-of-formation-reaction-605143 Helmenstine, Anne Marie, Ph.D. "Formation Reaction Definition." ThoughtCo. https://www.thoughtco.com/definition-of-formation-reaction-605143 (accessed January 24, 2021).