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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

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

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

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

Dependence of the reaction velocity on the type of substance I

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

Model experiment on the fractional distillation of petroleum

What you can learn about 
  • Distillative separation of a liquid mixture

  • How a fractional distillation works

  • Destillation of cruide oil
  • Composition of cruide oil (this experiment examines a model of crude oil)

 

...
 
Детали

Продукт No: P1308600

Electrostatic flue gas cleaning



Principle

Smoke consists of particles of solid substances suspended in gas. Fog is made up of suspended droplets. In cigarette smoke, as in many industrial processes, smoke and fog are frequently present together. The removal of particles contained in gases - predominately waste ...

 
Детали

Продукт No: P1309200

Faraday's laws

Principle

 


Faraday's first law states that the mass of a material separated by electrolysis is proportional to the quantity of electricity which flowed through the solution. The second law states that the electrochemical equivalents are proportional to their equivalent masses (molar ...

 
Детали

Продукт No: P1309500

Model experiment on the desulphurisation of flue gas

Principle

German coal contains an average of one tonne of sulphur per 100 tons of coal. The combustion of this 100 tons of coal "produces" about two tonnes of sulphur dioxide. In comparison a large 700 megawatt power plant which burns about 200 tons of coal per hour produces ...

 
Детали

Продукт No: P1310000

Molten-salt electrolysis

Principle

The electrolysis of molten sodium chloride to obtain chlorine and sodium, which can be used to produce sodium hydroxide, is an important industrial-scale process. The experiment is a simple demonstration of the important steps in this process. Due to the high melting point ...

 
Детали

Продукт No: P1310500

We examine our drinking water

Principle

This experiment shows how much the quality of drinking water of various locations in the same region can vary. The comparison of tap water with bottled mineral water and distilled water leads to surprising results.

Benefits

  • Experiment is part of an experiment set with ...
 
Детали

Продукт No: P1520062

Basic methods in imaging of micro and nanostructures with atomic force microscopy (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 ...

 
Детали

Продукт No: P2538000

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