Exercices : équations chimiques

The Experiments - iyc The Global Experiment consists of four experiments. It is expected that most teachers will work with their classes to carry out the four activities, which have explicit instructions and background materials. These will be helpful for teachers who do not have science backgrounds. The activities cover important topics and conceptual understanding in science and also provide a variety of opportunities to learn important experimental and data gathering skills. Alternatively, teachers can select to undertake a single activity if they want their students to collect some data and contribute to the Global Experiment without using the other activities, perhaps because water is studied at a different year level.

Le jus de chou rouge, indicateur coloré YannVerchier Enseignant de physicochimie De nombreuses substances naturelles possèdent la propriété de changer de couleur en fonction de l’acidité du milieu. Le chou rouge possède des colorants naturels. © Bpmm, Flickr CC by-nc-sa 2.0 Le jus du chou rouge, un indicateur coloré naturel La couleur du chou rouge est due à la présence de molécules de la famille des anthocyanes, colorants naturels présents dans de nombreux fruits rouges (fraises, mûres, cerises, myrtilles…). Préparation de l’indicateur coloré Mettre à chauffer 1 litre d’eau (une eau minérale dont le pH est neutre) dans une casserole.Couper la moitié d’un chou rouge en plusieurs morceaux et les mettre dans l’eau. Le jus de chou rouge, obtenu après filtration, est un indicateur coloré. © Dunod Le filtrat ainsi obtenu est un indicateur coloré. Les anthocyanes présents dans le chou rouge sont solubles dans l’eau et sont donc extraits par décoction.

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