Hydrogen in pure form on Earth seldom meets, but it is very spread in structure of connections: contains in water, in vegetable and animal organisms, in natural gases. In space it is the most widespread element.
It is required to you
- The edition in the general chemistry or the textbook in chemistry 8-9 class.
Instruction
1. To define hydrogen, it is necessary to know some of its properties. Some of them will help to cope with an objective at short notice, and some demand stay in chemical laboratory. It is optional to use all methods, sometimes there are enough one or two. Hydrogen - the easiest of all gases. For example, there can be a task is to define hydrogen, having available several vessels with unknown gases. In this case it is necessary to pay attention to a vessel - hydrogen has to be either in turned, or in closed (it is possible glass which can be removed for further definition). Otherwise hydrogen will disappear. This gas has no smell and color.
2. When firing, hydrogen burns with not shining flame, at the same time water is formed. A good way of definition, but very dangerous since mix of hydrogen and oxygen is called detonating gas because of its ability to blow up. Though it should be noted that at low temperatures this reaction will not go. Only at 300? A small amount of water begins to be formed by C, at 500? With there is an ignition, and at 700? C - explosion.
3. If to pass gas over the heated copper oxide, then copper will be restored - reddish metal as a result will turn out. For carrying out this experience it is necessary to follow safety rules and, it is desirable is in the corresponding conditions (in laboratory).
4. Also change of temperatures can help with definition of hydrogen. At-240? And under pressure it is liquefied by C, at-252.8? With with a normal atmospheric pressure - boils. If not to stop process of boiling, evaporating liquid, then hydrogen will take a form of firm transparent crystals.
5. There is one more way by means of which hydrogen can be defined even in various mixes is a chromatographic way of definition (the chromatography is a physical and chemical method of division of substances by distribution of components between two phases). Essential minus of this method is that not each person has an access to the corresponding devices to laboratories and qualification for work with them. But way this very exact.