Système d'Expérimentation Élèves TESS

The detection of carbon with lime-water

Organic substances contain carbon and hydrogen atoms in their molecular structures. This is the reason why carbon dioxide and water is always produced when these substances are burned.

In this experiment, different organic substances are combusted and students investigate which ...

Méthode de base de l'imagerie de micro et nanostructuresavec le microscope à force atomique (AFM)



Principle

Approaching a sharp silicon tip mounted on a cantilever to a sample surface leads to an atomic scale interaction. The result is a bend of the cantilever which is detected by a laser. In static mode the resulting deflection is used to investigate the topography of the ...

Properties of Matter,hardness, colour,magnetisability,water, solubility

This experiment shows in a simple way to investigate the properties of ( chemical ) substances to be investigated. In this experiment, students work with materials from everyday life  and study the difference of substances in terms of hardness , color , ...

Solubility of a substance

Principle

The solubility of a substance in a specific solvent (e.g. water) is a unique characteristic of this substance. In addition, all substances can be divided into specific groups of classes of substances (e.g. water-soluble substances).

Benefits

• Experiment guides are very easy to ...

Acidic or basic character of solutions

Principle

This experiment demonstrates how the characteristics of (chemical) substances can be examined. The students work with substances that they know from their everyday life and they determine the pH value or character (acidic, neutral or alkaline) of various solutions. For this purpose, ...

Properties of material - combustibility, melting point

Principle

Substances can be identified and described by means of their characteristic properties. The combustibility and the melting point belong to these properties and will be invetigated of iron, sand, sodium chloride, sulphur and naphtalene

Properties of matter - density determination

Principle

The density of a substance is an essential feature to identify a substance at specified temperature and pressure conditions  . With the help of the " density " substances can be characterized and divided in different classes ( metals in heavy and light metals ) . In this ...

Properties of matter - density determination

Principle

The density of a substance corresponds to the mass of a cubic centimetre of this substance. The density is thus defined as mass : volume (g/cm3). The density of irregular objects can be established by determining the mass by weighing it and the volume by the displacement of ...

Properties of mixtures

Principle

In this experiment students study mixtures and their properties (eg. water solubility). This experiment shows that finely divided materials and gases can be mixed in any proportion. Mixtures of solids generally appear heterogeneous, the individual components can be ...

Properties of mixtures

• Experiment guides are very easy to understand, especially for younger students
• Associated competences are directly linked to the experiments
• Curriculum compatible
• Fit for the future: implementation of tablets possible

Liquid mixtures

Mixtures can consist of solids, liquids or gases. Finely divided solids or gases can be mixed in any proportion with each other. In contrast some liquids can not be mixed together. There are liquids which mix completely with each other and others which mix hardly. In this ...

Mixture separation - evaporation

Mixture separations - filtration, magnatic separation

Principle

Many substances in nature are a mixture of two or more components. These mixtures can be separated into individual comonents by physical separation processes (for example by filtration). This experiment demonstrates how a mixture of salt and sand can be separated into its ...

Mixture separations by sieving and filtration

• Experiment guides are very easy to understand, especially for younger students
• Associated competences are directly linked to the experiments
• Curriculum compatible
• Fit for the future: implementation of tablets possible

Mixture separations by magnetic separation

Principle

This student experiment includes a demonstration of the principle of magnetic separation. In order to demonstrate the technical separation of mixtures, iron filings are separated from sand. The student experiment demonstrates the importance of this method, which is also known as ...