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Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 DEF

The electrostatic attraction between positive and negatively charged ions.  1, fiche 1, Anglais, - polar%20attraction

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 DEF

Attraction électrostatique entre des ions négatifs et des ions positifs.  1, fiche 1, Français, - attraction%20polaire

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

Common adsorbents are either polar or hydrophilic types, or nonpolar, hydrophobic types. ... Nonpolar adsorbents, such as coal-derived carbons and activated carbons, are generally used to remove less polar contaminants from polar bulk streams ...  3, fiche 2, Anglais, - nonpolar%20adsorbent

Record number: 2, Textual support number: 2 CONT

[A] significant adsorptive characteristic is possessed not alone by carbons, charcoal and chars, but also by such materials as zeolite, silica, alumina, mica and some other. All these differ widely in the number and kinds of substances they adsorb, as well as in the amount of sorbed substances they will retain. In general, the silicaneous, metallic oxides and active earth types of adsorbents are electrically polar-that is, their molecular structure contains an unsymmetrical electron distribution. Since polar substances have strong attraction for one another and since water is highly polar, the polar adsorbents mentioned above retain water in preference to most other fluids and are, therefore, incapable of adsorbing non-aqueous gases efficiently from a humid atmosphere. For use in air conservation, however, which requires a sorbent to extract very small quantities of a very numerous variety of gases and vapors from either dry or humid air during a very brief interval of contact, non-polar adsorbents such as specially processed carbon of high activity, dense structure and extreme relative hardness have been found to be adequate. Activated carbon, being non-polar and hence electronically symmetrical in structure, has no particular affinity for moisture and preferentially adsorbs organic gases and vapors.  4, fiche 2, Anglais, - nonpolar%20adsorbent

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 OBS

Les zéolithes sont des alumino-silicates cristallisés microporeux de formule globale (AlO₂M,nSiO₂) où M représente le plus souvent un métal alcalin ou alcalino-terreux et n [est plus grand que ou égal à] 1. Il existe plus de 100 espèces de zéolithes, différant par la valeur de n et la structure cristallographique. La présence de cations dans les micropores génère des champs électriques de l'ordre de 10¹⁰ V.m^-1, ce qui fait de ces corps de puissants adsorbants polaires. [...] Les alumines activées sont des adsorbants amorphes, moyennement polaires et hydrophiles.  2, fiche 2, Français, - adsorbant%20non%20polaire

Record number: 2, Textual support number: 2 OBS

[...] la cyclohexanone se désorbe très mal et [...] la désorption des éthers de glycol nécessite des essais préalables associant souvent des solvants de désorption polaires et non polaires.  3, fiche 2, Français, - adsorbant%20non%20polaire

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

A chemical compound whose molecules exhibit electrically positive characteristics at one extremity and negative characteristics at the other.  2, fiche 3, Anglais, - polar%20compound

Record number: 3, Textual support number: 1 CONT

Polar compounds are used as additives in many petroleum products. Polarity gives certain molecules a strong affinity for solid surfaces; as lubricant additives(oiliness agents), such molecules plate out to form a tenacious, friction-reducing film. Some polar molecules are oil-soluble at one end and water-soluble at the other end; in lubricants, they act as emulsifiers, helping to form stable oil-water emulsions. Such lubricants are said to have good metal-wetting properties. Polar compounds with a strong attraction for solid contaminants act as detergents in engine oils by keeping contaminants finely dispersed.  2, fiche 3, Anglais, - polar%20compound

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 OBS

Polaire : Se dit des composés dont la formation correspond à un transfert d'électrons (électrovalence).  2, fiche 3, Français, - compos%C3%A9%20polaire

Record number: 3, Textual support number: 2 OBS

La solubilité d'un corps pur dans un solvant peut être prévue assez aisément à l'aide d'une règle simple : Deux composés de polarités similaires sont solubles entre eux, alors qu'un composé non polaire est insoluble dans un solvant polaire (et vice versa).  3, fiche 3, Français, - compos%C3%A9%20polaire

Fiche 3,  Justifications,  Espagnol