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Détergent tensio-actifs cationiques

6ème Esthétique - CHIMIE APPLIQUEE

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Détergent tensio-actifs cationiques

Domaine	Science	Sous domaine	Science
Section	Technique	Option	Esthétique
Discipline	CHIMIE APPLIQUEE	Classe	6ème
Matériel didactique	Savon	Auteur	SCHOOLAP.COM
Objectif opérationnel	A la fin de la leçon, l’élève sera capable de ……………
Réference	Chimie pour un coiffeur. Martine P.96-98
Activité initiale
Rappel Quelles sont les bases lavantes que vous connaissez ?		Rappel Les bases lavantes sont : Les alkyls sulfates de sodium Les alkyls sulfates d’ammoniums et lauryl sulfates.
Motivation Comment appelle-t-on les ions positifs ?		Motivation Les ions positifs sont appelés les cations, on les trouve dans les tensio-actifs.
Annonce du sujet Qu'allons nous étudier aujourd'hui?		Annonce du sujet Aujourd'hui nous allons étudier le Détergent tensio-actifs cationiques
Activité principale
Analyse Comment se présente les tensio-actifs cationiques ? Citez les sels d’amine grasse que vous connaissez ? Quelle est la structure de tensio-actif cétoniques. Qu’est-ce que les tensio-actifs amphores ?		Analyse LE DETERGENT les tensio-actifs cationiques Ils se présentent sous forme de cation actif volumineux et d’un anion actif minéral. Ex : CH3-(CH2)n-CH2-X⁺+Y^- Cation actif : CH3(CH2)n-CH2-X⁺ Anion actif : Y^- Ces tensio-actif sont en particulier des sels d’ammonium quaternaire ou des sels d’amine grasse. Ex : CH3-(CH2)11-N (CH3)₃⁺Cl^- : Chlorure de lauryl triméthyl d’ammonium CH3 - (CH2) 11 - NH3⁺ Cl-2 chlorure d’amine grasse. Sa structure Les tensio-actifs amphotères Ils sont ceux qui se chargent positivement ou négativement suivant le PH du milieu. Ce sont des aminoacides substitués comportant une chaîne grasse. N.B : Les tensio-actifs non ioniques sont ceux qui ne s’ionisent pas dans l’eau. Ex : R-COOH+R-CH-R-COO-CH2R’. R’ est une chaine hydrophile plus polyoxyéthylène (au moins longue glycol, Glycérol).
Synthèse
Comment se présentent les tensio-actifs cationiques ?		Les tensio-actifs cationiques se présentent sous forme d’un radioactif volumineux.

Messages Timeline Exceptions Views7 Route Queries13 Models17 Gate Session Request

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