activation energy

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activation energy (

-v

The least amount of energy needed for a chemical reaction to take place. Some elements and compounds react together naturally just by being close to each other, and their activation energy is zero. Others will react together only after a certain amount of energy is added to them. Striking a match on the side of a matchbox, for example, provides the activation energy (in the form of heat produced by friction) necessary for the chemicals in the match to ignite. Activation energy is usually expressed in terms of joules per mole of reactants.

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Noun

activation energy - the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur; "catalysts are said to reduce the energy of activation during the transition phase of a reaction"

energy of activation

energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"

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energy energy of activation free energy			35 Reaction rate, reaction order and activation energy of sulfonation, diffusion coefficient and activation energy of diffusion were investigated. Sulfonation of solid polystyrene using gaseous sulfur trioxide by Kucera, F.; Jancar, J. / Polymer Engineering and Science The apparent activation energy of the deposition process can be determined from the deposition rates at different temperatures using the Arrhenius law K = A exp (-[E. Morphologies and growth mechanisms of zirconium carbide films by ... by Liu, Qiaomu; Zhang, Litong; Cheng, Laifei; Wang, Yiguang / JCT Research Important information about the structure of the blends can be obtained from the changes in the flowing process activation energy [E. Heterogeneous polyvinylchloride blends with chlorinated polyethylene: ... by Ivanova, Tatjana; Elksnite, Ilze; Zicans, Janis; Meri, Remo Merijs; Kalnins, Martins; Kalkis, Valdis / Proceedings of the Estonian Academy of Sciences			action spectrum action stations action-packed actionable Actionably Actionary actioner Actionless Actions Actitis Actitis hypoleucos Actitis macularia Actium Activase activate activated activated alumina activated carbon activated charcoal activated sludge activating activating agent activation activation analysis activation detector activation energy activator active active agent active air defense active application active birth Active capital active centre active citizen active communications satellite active defense active duty active duty for special work active duty for training active galactic nucleus active galaxy Active Guard and Reserve active homing guidance Active hyperaemia active immunity active list active margin active material active matrix active matrix screen			Activating Transcription Factor 3 Activating Transcription Factor 4 Activating Transcription Factor 5 Activating Transcription Factor 6 Activating Transcription Factor 7 Activating Transcription Factor-1 Activating Transcription Factor/cAMP Response Element Binding Protein activation activation activation activation activation activation Activation & Evaluation activation analyses activation analyses activation analyses activation analysis activation analysis activation analysis activation analysis activation analysis Activation Analysis Group Inc. Activation and Checkout Activation Binding Site Activation code activation cross section activation detector Activation Domain 1 Activation Domain 2 activation energy Activation enthalpy Activation enthalpy Activation enthalpy Activation enthalpy activation factor activation factor activation factor Activation Fee Activation Fees Activation framework Activation framework Activation framework Activation framework Activation Function 1 Activation Function 2 Activation Function 2 Domain Activation Function Domain 2 Activation Library Activation Manager Activation of Dioxygen and Homogeneous Catalytic Oxidation activation of prejunctional P1 Activation Order Activation product Activation product Activation products Activation Receptor Homology Sequence 1 activation record Activation Request Activation server Activation server

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