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NULL ISOTOPE EFFECT [2 records]
Record 1 - internal organization data 1997-09-26
Record 1, English
Record 1, Subject field(s)
- Chemistry
Record 1, Main entry term, English
- unity isotope effect
1, record 1, English, unity%20isotope%20effect
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- null isotope effect 1, record 1, English, null%20isotope%20effect
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The absence of isotopic discrimination for rate or equilibrium constants (klight/kheavy = 1 or Klight/Kheavy = 1) ... 1, record 1, English, - unity%20isotope%20effect
Record number: 1, Textual support number: 1 OBS
It is more commonly thought of as a null isotope effect, on the grounds that there is zero isotopic effect on the corresponding standard Gibbs energy change. i. e. that an isotope effect exists only when the ratio of rate or equilibrium constants differs from unity. 1, record 1, English, - unity%20isotope%20effect
Record 1, French
Record 1, Domaine(s)
- Chimie
Record 1, Main entry term, French
- effet isotopique unité
1, record 1, French, effet%20isotopique%20unit%C3%A9
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- effet isotopique nul 1, record 1, French, effet%20isotopique%20nul
correct, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
[...] absence d'effet d'un isotope sur les constantes de vitesse ou d'équilibre (k [indice] léger/k [indice] lourd= 1 ou K [indice] léger/K [indice] lourd = 1) [...] 1, record 1, French, - effet%20isotopique%20unit%C3%A9
Record number: 1, Textual support number: 1 OBS
[...] on parle plus communément d'«effet isotopique nul», puisqu'il n'y a pas d'effet isotopique sur la différence des énergies de Gibbs standard. En d'autres termes, on considère qu'il y a un effet isotopique que lorsque le rapport des constantes de vitesse ou d'équilibre est différent de l'unité. 1, record 1, French, - effet%20isotopique%20unit%C3%A9
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1997-07-09
Record 2, English
Record 2, Subject field(s)
- Chemical Engineering
Record 2, Main entry term, English
- element effect
1, record 2, English, element%20effect
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
The ratio of the rate constants of two reactions that differ only in the identity of the element of the atom in the leaving group by which the leaving roup is attached to the rest of the substrate molecule. As for isotope effects, a ratio of unity is thought of as a null effect. 1, record 2, English, - element%20effect
Record 2, French
Record 2, Domaine(s)
- Génie chimique
Record 2, Main entry term, French
- effet d'élément
1, record 2, French, effet%20d%27%C3%A9l%C3%A9ment
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Rapport des constantes de vitesse de deux réactions qui ne diffèrent que par l'identité de l'atome du groupe partant par lequel ce groupe est lié au reste de la molécule que l'on considère comme substrat. Comme dans le cas des effets isotopiques, on considère que l'effet est nul quand ce rapport est égal à un. 1, record 2, French, - effet%20d%27%C3%A9l%C3%A9ment
Record 2, Spanish
Record 2, Textual support, Spanish
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