Химия

 
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Binding of nitrogen by base metals

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 ...

 
Детали

Продукт No: P1140500

Ammonia preparation from the elements (Haber-Bosch process)

Principle

 Ammonia (which is of technical and economic importance) is obtained from the reaction of nitrogen with hydrogen. But this reaction is strongly inhibited (high activation energy is needed to start the reaction) and leads normally to poor yields. Beacuse of this reason Fritz ...

 
Детали

Продукт No: P1140700

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
...
 
Детали

Продукт No: 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 ...
 
Детали

Продукт No: P1143400

Production of metal alloys

What you can learn about
  • Preparation of alloys
  • Brass and bronze
  • Alloys are mixtures not compounds
 
Детали

Продукт No: P1143901

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 ...

 
Детали

Продукт No: P1145500

Acidic, neutral and alkaline reactions 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 / ...

 
Детали

Продукт No: P1145600

Electrolytic deposition and quantity of electricity (Fara-

Principle

During an electrolysis reaction, the deposited mass m of a substance is directly proportional to the flow of charge (First Faraday's law). The second Faraday law states that the electrochemical equivalents k (deposited mass per charge unit) behave like the equivalent masses ...

 
Детали

Продукт No: P1147500

Hydrogen in the redox series: normal hydrogen electrode

Principle

The redox series is one of the most important tools in "electrochemistry". The redox series arrange metals according to their efforts to emit electrons. The redox series generally begins with the base metals (e.g., iron, zinc) and goes to noble metals (e.g., gold, ...

 
Детали

Продукт No: P1148400

Dependence of the reaction velocity on the concentration (Landolt reaction)

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

 

 
Детали

Продукт No: P1149300

The detection of carbon with lime-water

Principle

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 ...

 
Детали

Продукт No: P1149701

Temperature behaviour of organic compounds

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

 

 
Детали

Продукт No: P1149800

Keto-enol tautomerism of ethyl acetoacetate (3-oxobutanoicacid ethyl ester)

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 ...

 
Детали

Продукт No: P1154000

U-tube manometer

Principle

The suitability of a U-tube partially filled with liquid as an instrument for measuring pressure (manometer) it is to be demonstrated.

 

Benefits

  • Optimised for demonstration experiments: Transformation from horizontal into vertical direction
  • Very good visibility: Big ...
 
Детали

Продукт No: P1296700

Hydrostatic pressure

Principle

The dependence of the hydrostatic pressure on the depth of immersion h and on the density ρ of a liquid, and the relationship between the pressure p and the quantities h and p, are to be demonstrated.

Benefits

  • Optimised for demonstration experiments: Transformation from ...
 
Детали

Продукт No: P1296800

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