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Chemistry

Ions et charges

Notions fondamentales sur les ions, les anions, les cations, les solutions ioniques et la notation des charges électriques.

3rd grade · 4 units · 9 concepts · Shared by Anatole

  1. Unit 1

    Définition et nature des ions

    Définition de l'ion, sa constitution et sa charge électrique non neutre.

    • Définition de l'ion

      Définir un ion comme un atome ou un groupe d'atomes ayant gagné ou perdu des électrons lors d'une transformation chimique.

    • Constitution d'un ion

      Identifier qu'un ion peut être formé d'un seul atome ou d'un groupe d'atomes.

    • Charge électrique de l'ion

      Indiquer qu'un ion n'est pas électriquement neutre et possède une charge électrique positive ou négative.

  2. Unit 2

    Anions et cations

    Distinction entre anions (charge négative) et cations (charge positive).

    • Définition de l'anion

      Définir un anion comme un ion de charge électrique totale négative possédant trop d'électrons.

    • Définition du cation

      Définir un cation comme un ion de charge électrique totale positive ayant perdu des électrons.

  3. Unit 3

    Solutions ioniques

    Définitions des solutions chimiques et ioniques.

    • Définition d'une solution

      Définir une solution comme un liquide contenant une ou plusieurs espèces chimiques.

    • Solution ionique

      Définir une solution ionique comme un liquide contenant des ions.

  4. Unit 4

    Notation et exemple

    Notation symbolique des ions et étude de l'exemple du fer.

    • Notation symbolique

      Écrire la notation symbolique d'un ion avec sa charge, comme Fe2+Fe^{2+}.

    • Exemple de l'ion fer

      Expliquer la transformation de l'atome de fer en ion Fe2+Fe^{2+} par perte de deux électrons.

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