Химия

 
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Water quality - contamination with heavy metals

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 ...

 
Детали

Продукт No: P0990162

Melting and freezing curve of sodium thiosulphate

Benefits
  • 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 ...

    ...
 
Детали

Продукт No: P1044668

Melting and freezing of sodium thiosulphate with SMARTsensesodium thiosulphate

 
Детали

Продукт No: P1044669

Chemical process: synthesis and analysis

 
Детали

Продукт No: P1131701

Air - a mixture of the gases oxygen and nitrogen

Principle

 In this experiment the  composition of air is investigated. Therefor soild copper is heated on air. Copper combines with the oxygen of air and forms copper oxide. If this reaction is performed in a closed apparatus and the air volume is measured before and after the ...

 
Детали

Продукт No: P1133400

The law of conservation of mass in chemical reactions

Principle

This experiment confirms the law of conservation of mass by the precipitation of calcium carbonate in the vessel according to Landolt. For this experiment two solutions with the starting material  are filled separately into two limbs of a vessel.  Afer that ...

 
Детали

Продукт No: P1134300

Osmosis - dependence of the osmotic pressure on the concentration

Principle

Osmosis describes the phenomenon that solvent molecules move through a partially permeable membrane into a region of higher solute concentration. Thus, the concentration of solute is equalized on both sides. The experimental set-up consists of seven chambers that are filled with ...

 
Детали

Продукт No: P1135700

Enthalpy and entropy as driving forces of chemical reactions

Principle

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 ...

 
Детали

Продукт No: P1136300

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

Production of metal alloys

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

Продукт No: P1143901

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 type of substance

What you can learn about
  • reaction rate
  • different electrochemical potentials lead to different reaction rates
  • reaction of metals with acid

 

 
Детали

Продукт No: P1149100

Dependence of the reaction velocity on the temperature

Principle

The reaction velocity is highly dependent on the temperature. In this experiment magnesium reacts with acetic acid. Comparing the velocity at the beginning of the reaction shows that the velocity doubles when the temperature increases 10 K.

Tasks

Investigate the reaction of ...

 
Детали

Продукт No: P1149400

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

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