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Hydrogen is one of the essential elements on earth, and it has the most basic atomic structure of any known element. Hydrogen is essential for the survival of all living things. It coexists with a variety of compounds and enables a variety of features. Hydrogen is one of the most significant and unique elements because of its physical and chemical properties. In this chapter, we’ll go over hydrogen in detail, including its characteristics and various compounds.
Hydrogen and its existence in nature
Hydrogen, with the simplest atomic structure H2, is the most abundant element in the universe and 3rd most abundant on Earth’s surface. It is a diatomic molecule in its elemental state, therefore H2. This element can be found in various forms in nature, including water, the earth’s crust, and even the environment. In addition, isotopes exist, which are elements that have the same no. of electrons but a variable number of neutrons. Protium, Deuterium, and Tritium are the three isotopes. One, two, and three neutrons are present in the isotopes.
Physical properties of the Hydrogen
Melting point (K) | 13.96 |
Density (g/L) | 0.09 |
Ionic radius (pm) | 208 |
Taste | Tasteless |
Odour | Odourless |
Colour | Colourless |
Relative atomic mass (g/mol) | 1.008 |
Boiling point (K) | 20.39 |
Chemical Properties of the Hydrogen
The enthalpy of bonding dissociation determines all of the hydrogen’s chemical characteristics. The amount of energy necessary to break the H-H bond and make new bonds with other atoms is determined by the amount of energy required. When the energy required to establish a new bond is higher, the likelihood of generating a new molecule is lower than when the energy required is lower.
Enthalpy of fusion(KJ/mol) | 0.117 |
Ionisation enthalpy(KJ/mol) | 1312 |
Reaction with halogens Forms | halides |
Reaction with metals | Forms metal hydrides |
Reaction with nitrogen | Forms ammonia |
Bond dissociation enthalpy(KJ/mol) | 435.98 |
Electron gain enthalpy(KJ/mol) | -73 |
Uses of Hydrogen
- Hydrogen is utilised to make ammonia, then used to make nitric acid and nitrogen-based fertilisers.
- The hydrogenation of the vegetable oils such as cottonseeds, soya beans, and others produces dihydrogen, which is utilised to produce vanaspati fat.
- It’s used to make a lot of organic compounds, including methanol. In the existence of a cobalt catalyst, CO (g) reacts with 2H2 (g) to produce methanol.
- It is primarily utilised in the production of metal hydrides.
- Hydrogen is necessary to produce hydrogen chloride, a precious chemical.
- It is used to convert strong metal oxides to metals in metallurgical processes.
- Welding and cutting are done with atomic hydrogen and oxyhydrogen torches. The breakdown of hydrogen to use an electric arc allowed to rest on the surface to be welded produces atomic hydrogen atoms at a high temperature of 4000K.
- It is used as rocket fuel in space research.
- Hydrogen is utilised in fuel cells to create electricity. This sort of energy provides several advantages over traditional fossil fuels and other energy sources. It does not pollute the air by releasing dangerous elements into the environment. Compared to gasoline and other fuels, it produces more energy per unit mass of fuel.
Compounds of Hydrogen and their Importance
Water: Water is, first and foremost, a component of all living species on the planet. The human body contains up to 65 percent water, while plants contain up to 95 percent. Human beings have long recognised the importance of water as a necessity for living and a vital solvent.
Hydrides: Hydrogen forms hydrides when it reacts with all elements except noble gases under certain conditions. If M is the component, then MxHy is the hydride of that element. In the chemical industry, hydrides are extremely important. These are divided into three categories:
- Saline or Ionic hydrides
- Molecular or Covalent hydrides
- Non-stoichiometric or Metallic hydrides
Hydrides have electron deficiency, non-volatility, crystalline structure, electron efficiency, and other features. It does, however, play an important role in the fields of industrial electrochemistry.
Hydrogen Peroxide: Another important hydrogen component is hydrogen peroxide, which is also known as dihydrogen dioxide chemically and is a strong reducing agent. It has been employed to manage pollution from industries since the dawn of modern times. Peroxide hydrogen is a chemical molecule created through high-temperature reactions.
Conclusion
In the above article, we have read about the definition, chemical structure and uses of hydrogen. Hydrogen, with the simplest atomic structure H2, is the most abundant element in the universe and 3rd most abundant on Earth’s surface. It is prepared in laboratories, industries and institutions by different chemical processes. It is one of the most crucial compounds used as the fuel in rockets, used as a reducing agent in metallurgy, in the production of vegetable ghee etc. The various compounds of hydrogen are water, hydrides and hydrogen peroxide.
