How to hydrogen
Pure hydrogen on rare earth, but it is very common in the compounds: water contained in vegetable and animal organisms in natural gases. In the same space is the most abundant element.
You will need:
The publication on general chemistry or chemistry textbook for grade 8-9.
Instruction how to identify the hydrogen
To determine the hydrogen, it is necessary to know certain properties. Some of them will help to cope with this task in a short time, and some require a finding in a chemical laboratory. Optional use all methods, sometimes missing one or two. Hydrogen - the lightest of all gases. For example, it can be challenged - to determine the hydrogen, having the presence of several vessels with unknown gases. In this case it is necessary to pay attention to the vessel - either hydrogen must be in an inverted or in a closed (possibly glass, which can move the further definition). Otherwise, the hydrogen will evaporate. Smell and color of this gas does not.
When ignited, hydrogen burns non-luminous flame, forming water. A good way to determine, but it is very dangerous, because a mixture of hydrogen and oxygen called detonating gas due to its ability to explode. Although it should be noted that the reaction will not go at low temperatures. ? Only starts at 300 C to form a small amount of water, at 500 C there is a fire, and at 700 C -?? Explosion.
If the gas is to skip over incandescent copper oxide, copper is restored - the result is a reddish metal. To carry out this experiment is necessary to observe the safety regulations, and is desirably in the appropriate conditions (in the laboratory).
Also, hydrogen can help determining the temperature change. ? At -240 C and under pressure it liquefies at -252,8 C at normal atmospheric pressure - boils. If the boiling process does not stop, evaporating the liquid, the hydrogen will take the form of solid transparent crystals.
There is another way by which hydrogen can be determined even in various mixtures - a chromatographic method for determining (chromatography - a physico-chemical method for separating substances by distributing components between the two phases). A significant disadvantage of this method lies in the fact that not everyone has access to appropriate instruments in the laboratory and qualified to work with them. But this method is very accurate.