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La concentration

5ème Biologie Chimie - Chimie

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La concentration

Domaine	Science	Sous domaine	Science
Section	Scientifique	Option	Biologie Chimie
Discipline	Chimie	Classe	5ème
Matériel didactique	Tableau noir et craies blanches	Auteur	SCHOOLAP.COM
Objectif opérationnel	A l’issue de la leçon, l’élève sera capable de calculer les expressions de la concentration.
Réference	Maitrise chimique 3
Activité initiale
Rappel Qu’est-ce qu’une solution ?		Rappel Une solution est l’ensemble de la soluté et du solvant. Exemple: L’eau et le pétrole
Motivation Comment appelle-t-on une solution qui a plus de soluté ?		Motivation Une solution qui a plus de soluté s’appelle la solution saturée.
Annonce du sujet Qu'allons-nous étudier aujourd'hui?		Annonce du sujet Aujourd'hui, nous allons étudier la concentration.
Activité principale
Analyse Concentration Définition Qu'est-ce qu'une concentration?		Analyse Concentration Définition La concentration d’une solution est la quantité de la soluté pur dans une unité de volume ou masse de solution ou de solvant.
Qu'est-ce que la concentration massique?		Les expressions de concentration Concentration massique (C) ou g/l Elle est la masse du soluté en g dans un litre de solution. C : en g/l, mg : en g et V : en litre.
Une maman utilise 25g de sel pour préparer 500 ml d'eau salée. Quelle est la concentration de cette solution?		Pourcentage en masse ou degré de pureté Une maman utilise 25g de sel pour préparer 500 ml d'eau salée. Quelle est la concentration de cette solution? V=500ml m=25g, trouver C= ? Le pourcentage en masse est le même en gramme de soluté pur dans 100g de solution. Il existe aussi le pourcentage en volume et le pourcentage en mas-vol.
Synthèse
Quelles sont les unités de : C ? P ? % ?		Les unités se repartissent de la manière suivante : C l'unité est le g/l P l'unité est % % = % sans unité

Messages Timeline Exceptions Views7 Route Queries14 Models20 Gate Session Request

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