Chimie - Divers

 
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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 ...

 
Détails

Numéro d´article: P1132500

Rapid combustion- explosions

Principle

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 ...

 
Détails

Numéro d´article: P1133700

The law of reciprocal proportions in chemical réactions

 
Détails

Numéro d´article: P1134400

Metastable chemical systems and energy of activation

Principle

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 ...

 
Détails

Numéro d´article: P1136400

Properties of lithium, sodium and potassium

Benefits
  • 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
...
 
Détails

Numéro d´article: P1137300

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 ...
 
Détails

Numéro d´article: P1138000

Binding of nitrogen by base métals

Principle

In this experiment the reactivity of nitrogen with various metals is investigated. Nitrogen as a typical non-metal should react with metals to the corresponding salt in the form of an exothermic reaction. However metals react only very little with nitrogen. Nitrogen reacts at room ...

 
Détails

Numéro d´article: P1140500

Graphite and diamond

Principle

In this experiment, the properties of graphite powder and diamond are examined and compared.The experiments show that graphite, diamond and coal are very different from the external impression, and are used in very different industrial fields. In chemical reactions it
...
 
Détails

Numéro d´article: P1142200

Properties of aluminium

Principle

In this experiment, the properties of graphite powder and diamond are examined and compared.

Benefits

  • Experimental literature available for pupils and teachers: Minimum preparation time
  • Hazard assessment for pupils and teachers available
  • Easy teaching and efficient ...
 
Détails

Numéro d´article: P1143400

Complex salts

Principle 

In this experiment students investigate the formation of a complex compound. They recognize that a complex compound is already present in aqueous solution for many metal ions of the subgroup elements. The central ion is surrounded by a hydrath nozzle (water ...

 
Détails

Numéro d´article: P1145500

Acidic, neutral and alkaline réactions of solutions of salts

Principle

The pH-value of a prepared salt solution can be predicted by the strength of the acids and bases which are part of the salt solution. Salts of equally strong acids and bases (e.g., NaCl) react neutral in aqueous solution. Salts of a weak acid / base and strong base / ...

 
Détails

Numéro d´article: P1145600

Vitesse de réaction en fonction de la concentration (réaction de Landolt)

What you can learn about
  • Landolt reaction
  • reaction rate
  • reaction rate depends on concentration of reactants

 

 
Détails

Numéro d´article: P1149300

Temperature behaviour of organic compounds

What you can learn about
  • Properties of organic compounds
  • Thermal stability
  • Many organic compounds are sensitive to heating

 

 
Détails

Numéro d´article: P1149800

Keto-enol tautomerism of ethyl acetoacetate (ethyl 3-oxobu- tanoate)

Principle

Keto-enol tautomerism is understood in chemistry as the equilibrium between the structural form of an aldehyde and a ketone (the compounds must be constitution isomers). The name "enol" reflects the double bond (-en) and the OH group (-ol) in the molecular structure.

In this ...

 
Détails

Numéro d´article: P1154000

Ensemble DEMO Chimie "Lois de Faraday"

Avantages
  • Application claire de la loi Faraday´schen
  • utilisation interdisciplinaire possible
  • Préparation rapide et facile des tests (instructions de test et évaluation des risques disponibles)

 

 
Détails

Numéro d´article: P1309500

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