Chimie

Water quality - contamination avec heavy métals

Principle

Heavy-metal ions may be carried into surface or ground water from mining fields or via the waste water of galvanic or similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlled by these enzymes may ...

électrolysis of water

In the case of simple electrolysis (for example electrolysis of water) an electrolysis cell consists of two identical electrodes (mostly graphite or platinum), which are immersed in an (electrolyte) solution. In this experiment sodium hydroxide solution is used as an electrolyte ...

Introduction to the électron transfer réaction

Principle

In this experiment students examine the reaction of metals in salt solutions.  Students put iron or iron wool into a copper sulfate solution and solid copper into an iron sulfate solution.  With this experiment students learn that metals can be deposited from a salt ...

Courbes de fusion et de solidification dethiosulfate de so- dium

• Especially understandable and didactic prepared experiment descriptions including protocol

• Future-proof lessons: Integration of tablets in digital science lessons

• Enhanced motivation of students due to the use of the intuitive measureAPP

• Increase of media ...

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Melting and freezing of sodium thiosulphate with SMARTsensesodium thiosulphate

Synthesis and analysis

séparation of à mixture of liquids by distillation

Principle

The separation of liquid mixtures can be achieved by a simple distillation.  In this experiment a liquid mixture of water and ethanol is distilled by using a distillation column. Various fractions of the distillate are obtained with the help of a rotatable receiver. The ...

Air- à mixture of the gases oxygen and nitrogen

Dans cette expérience, la composition chimique de l'air est étudiée. Le cuivre massif est chauffé en présence d'air. Lorsqu'il est chauffé, le cuivre se combine à l'oxygène de l'air pour former de l'oxyde de cuivre. Si cette ...

Rapid combustion- explosions

This experiment shows that the combustion rate depends on the degree of dispersion and the mixing with oxygen (or the oxidizing agent). Students observe that metals such as aluminum and magnesium are  non-flammable in compact form or when they burn , they burn ...

The law of reciprocal proportions in chemical réactions

Osmose - pression osmotique en fonction de la concentration

• osmose
• pression osmosmotique
• Concentration

Enthalpie et entropie en tant que forces motrices des réactions chimiques

The experiment examine the terms enthalpy and entropy as the main forces of chemical reactions. Students perform the reaction of zinc and hydrochloric acid as an example of an exothermic reaction. The heat, which is developed by the raction, is measured with a thermometer. The ...

Metastable chemical systems and energy of activation

This experiment shows that exothermic reactions start not always spontaneous when two (or more) substances are mixed together. Students realize that no reaction occurs when the reactants (in solid state) are mixed together. The solids usually begin to react with each ...

Properties of lithium, sodium and potassium

• Experimental literature available for pupils and teachers: Minimum preparation time
• Hazard assessment for pupils and teachers available
• Easy teaching and efficient learning using the available interactive experiment literature

réaction of magnesium and calcium avec water- hydroxide for-mation

Principle

This experiment introduces alkaline earth metals with calcium and magnesium as representatives. Magnesium and calcium both show high chemical reactivity. The experiment also shows the reaction of the latter with water and respective hydroxide formation.

Benefits

• Experimental ...