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POLAR COMPOUND [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-08-22

English

Subject field(s)
  • Chemistry
OBS

Polar: Descriptive of a molecule in which the positive and negative electrical charges are permanently separated, as opposed to nonpolar molecules in which the charges coincide.

French

Domaine(s)
  • Chimie
OBS

Polaire : Une molécule est formée d'atomes, eux-mêmes constitués de charges négatives gravitant autour d'un noyau positif; si la répartition de ces charges admet une symétrie suffisante pour que les barycentres des charges positives et des charges négatives coïncident, la molécule est dite non polaire [...] Dans le cas contraire, la molécule est polaire, comme pour l'eau et pour un grand nombre de substances [...]

OBS

Polaire : Se dit d'une substance formée de telles molécules.

Spanish

Save record 1

Record 2 2001-10-22

English

Subject field(s)
  • Chemistry
  • Petrochemistry
  • Extinguishing Agents
DEF

A chemical compound whose molecules exhibit electrically positive characteristics at one extremity and negative characteristics at the other.

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.

French

Domaine(s)
  • Chimie
  • Chimie du pétrole
  • Agents extincteurs
OBS

Polaire : Se dit des composés dont la formation correspond à un transfert d'électrons (électrovalence).

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).

Spanish

Campo(s) temático(s)
  • Química
  • Petroquímica
  • Agentes extintores
Save record 2

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