activation

also contains definition of: degree of activation
https://doi.org/10.1351/goldbook.A00093
This word is used in different senses:
  1. Input of external energy into a chemical system is said to bring about activation of the system.
  2. An added substance that increases the rate of a catalysed reaction is known as an activator, and the effect is called activation. The degree of activation εa is defined by: εa=v−v0v0=vv0−1 where v0 is the rate of the catalysed reaction in the absence of the activator and v is the rate of the catalysed reaction in the presence of the activator.
  3. When some of the energy required for a reaction to occur is provided by a previous exothermic chemical reaction there is said to be chemical activation.
See: catalysis, chemical activation
See also: activator, inhibition
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 151 [Terms] [Paper]
Citation: 'activation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00093 RIS BibTex EndNote
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