Химия

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 ...

Electrolysis 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 electron transfer reaction

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 ...

Melting and freezing curve of sodium thiosulphate

• 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

Chemical process: synthesis and analysis

Separation of a 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 - a mixture of the gases oxygen and nitrogen

 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 ...

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 definite proportions in chemical reactions

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 ...

Enthalpy and entropy as driving forces of chemical reactions

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

Reaction of magnesium and calcium with water - hydroxide

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 ...