TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
transition state [3 records]
Record 1 - internal organization data 1998-02-16
Record 1, English
Record 1, Subject field(s)
- Chemistry
Record 1, Main entry term, English
- transition state
1, record 1, English, transition%20state
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 OBS
In theories describing elementary reactions it is usually assumed that there is a transition state of more positive molar Gibbs energy between the reactants and the products through which an assembly of atoms (initially composing the molecular entities of the reactants) must pass on going from reactants to products in either direction. In the formalism of transition state theory the transition state of an elementary reaction is that set of states (each characterized by its own geometry and energy) such that an assembly of atoms, when randomly placed there, would have an equal probability of forming the reactants or of forming the products of that elementary reaction. 1, record 1, English, - transition%20state
Record 1, French
Record 1, Domaine(s)
- Chimie
Record 1, Main entry term, French
- état de transition
1, record 1, French, %C3%A9tat%20de%20transition
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
Dans les théories s'attachant à la description des réactions élémentaires, il est généralement admis qu'entre les réactifs et les produits il existe un état de transition dont l'énergie de Gibbs molaire est supérieure à celles de l'état initial et de l'état final et par lequel doit passer l'ensemble des atomes qui constituaient les entités moléculaires des réactifs (à l'état fondamental), pour aller des réactifs aux produits et inversement. Selon la théorie de l'état de transition, l'état de transition d'une réaction élémentaire correspond à un ensemble d'états (chacun d'eux est caractérisé par sa géométrie et par son énergie) tel qu'un assemblage d'atomes qui y serait placé par hasard conduirait aux réactifs ou aux produits avec la même probabilité. 1, record 1, French, - %C3%A9tat%20de%20transition
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1992-10-20
Record 2, English
Record 2, Subject field(s)
- Chemistry
- Artificial Intelligence
Record 2, Main entry term, English
- transition state
1, record 2, English, transition%20state
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
- semi-active state 1, record 2, English, semi%2Dactive%20state
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
A state that occurs when a material is about to change from a gas into a liquid, etc. 2, record 2, English, - transition%20state
Record number: 2, Textual support number: 1 OBS
Compare to dynamic and static states. 1, record 2, English, - transition%20state
Record number: 2, Textual support number: 1 CONT
At the saddle point of a col linking two potential wells, the direction of maximum negative curvature defines the reaction coordinate; the transition state is a hypothetical system of reduced dimensionality, free to move only on a hypersurface perpendicular to the reaction coordinate at its point of maximum energy. 1, record 2, English, - transition%20state
Record 2, French
Record 2, Domaine(s)
- Chimie
- Intelligence artificielle
Record 2, Main entry term, French
- état semi-actif
1, record 2, French, %C3%A9tat%20semi%2Dactif
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Etat [de l'objet] où l'hypothèse a été suggérée par différentes assertions mais pas suffisamment pour être mise sur la liste des hypothèses courantes. 1, record 2, French, - %C3%A9tat%20semi%2Dactif
Record number: 2, Textual support number: 1 CONT
Selon Szolovitz, les objets peuvent se trouver dans trois états : actif, semi-actif et inactif. 1, record 2, French, - %C3%A9tat%20semi%2Dactif
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 1989-12-19
Record 3, English
Record 3, Subject field(s)
- Biological Sciences
Record 3, Main entry term, English
- transition state
1, record 3, English, transition%20state
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 CONT
When molecules A and B react to give a product A-B, the reaction passes through a transition state A-B in which chemical bonds are being made and broken. The transition state is the most unstable species on the reaction pathway, and catalysis is achieved by stabilizing this state. 1, record 3, English, - transition%20state
Record 3, French
Record 3, Domaine(s)
- Sciences biologiques
Record 3, Main entry term, French
- état de transition
1, record 3, French, %C3%A9tat%20de%20transition
correct, masculine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 CONT
Une réaction chimique telle que A -> P se produit lorsqu'une certaine proportion de la population des molécules A possède à un certain moment suffisamment d'énergie pour atteindre un état activé, appelé état de transition, où la probabilité de créer ou de détruire une liaison chimique pour former le produit P est très grande. Cet état de transition et au sommet de la barrière énergétique séparant les réactifs des produits. La vitesse d'une réaction chimique déterminée est proportionnelle à la concentration des molécules ayant atteint cet état de transition. 1, record 3, French, - %C3%A9tat%20de%20transition
Record 3, Spanish
Record 3, Textual support, Spanish
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