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Mélange & combinaison

Rappel

Comment appelle t-on le passage de l'Etat solide à l'état gazeux? 

Comment appelle-t-on un corps qui n'a pas de forme propre

Motivation 

Un maçon, pour façonner les brique, il a du ciment pierre, sable,... avec toute ces matières. Qu'est-ce qu'il fait? 

Annonce

Qu'allons-nous étudier aujourd'hui?

Analyse 

Qu'est-ce que le mélange ? 

Il y a combien de sortes des mélanges? 

Qu'est-ce que le mélange Homogène ? 

Qu'est-ce que le mélange hétéroogène ? 

A quoi consiste l'analyse du mélange? 

Qu'est le principe du mélange des gaz? 

Quelle analyse fait-on pour se parer les différents constituants du mélange 

Synthèse 

Qu'est-ce que le mélange? 

Faites une différence entre le mélange homogène et mélange hétérogène ? 

Le passage de l'Etat solide à l'Etat gazeux s'appelle (l'el) la sublimation 

Le corps qui n'a pas de forme propre s'appelle le fluide

pour façonner les briques le maçon fauniras le mélange du ciment sables, l'eau....

Aujourd'hui , nous allons étudie : Mélange & combinaison 

II.1. MELANGE ET COMBINAISON

II.1.1. Mélange: le mélange est la mise ensemble d'air moins deux corps (matière) qui gardent leurs propriétés 

II.1.2. TYPES DE MELANGES: 

Nous distinguons deux types de mélanges: qui sont : 

  • mélange homogène 
  • mélange hétérogène 

II.1.2.1: Mélange Homogène: c'est un mélange dans le quel les différents constituants ne sont pas visible à l'oiel nue. ex: l'air, l'eau..

II.1.2.2: Mélange Hétérogène: Tout les constituants sont visible à l'oeil nu. Ex: mais + pierre. , sel + huille.

Analyse du mélange 

C'est une technique qui consiste à séparer les substances du mélange.

1) Mélange des gaz

a) principe: tout les constituants sont des gaz

b) Analyse: la technique de séparation de ce mélange: c'est la léque fration (fractionnée)

Cfr analyse 

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