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

Formation Reaction Definition: A formation reaction is a reaction where the one mole of product is formed.

Examples: 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, Jun. 11, 2014, thoughtco.com/definition-of-formation-reaction-605143. Helmenstine, Anne Marie, Ph.D. (2014, June 11). 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 April 23, 2018).