What is Hydrogen (H2)? Physical properties, chemical properties - Applications

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What is Hydrogen (H2)? How will Hydrogen gas (H2) be used in life? To know more about Hydrogen, please join us in the following article.


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  • Copper(II) sulfate (CuSO4)


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What is Hydrogen (H2)?


Hydrogen is a gas with the English name hydrogen and the Latin name hydrogenium. This is a chemical element in the periodic system of elements with an atomic mass of 1 (1dvC). It was formerly known as hydrogen because it is the lightest and most gaseous element in existence.


Hydrogen is the most abundant element in the universe, accounting for 75% of the total mass of the universe. Since hydrogen is a relatively rare naturally occurring element on Earth due to the light H2 gas, the Earth's gravitational field is not strong enough to keep them out into space, so hydrogen exists mainly as atomic hydrogen. in the upper layers of the atmosphere.


Hydrogen is a common, colorless, odorless, explosive, explosive gas commonly used in the form of a liquid gas.



  • Hydrogen is the lightest gas.

  • Hydrogen has the chemical symbol: H.

  • Chemical formula (of a single gas): H2.

  • Atomic mass of hydrogen: MH = 1. Molecular mass: MH2 = 2.


Hydrogen's physical properties



  • Hydrogen is a colorless, odorless, tasteless gas, the lightest gas in air and very slightly soluble in water.

  • 1 liter of water (at 15 °C) dissolves 20 ml of H2 gas.

  • Mass ratio of H2 to air: dH2/kk = 2/29.


Chemical Properties of Hydrogen


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Hydrogen is a reducing nonmetal. At suitable temperatures, it can combine with oxygen, metal oxides. Those are quite typical hydrogen chemical reactions. These reactions are exothermic.


Hydrogen reacts with oxygen


– Hydrogen reacts with oxygen at an appropriate temperature according to the equation:


2H2 + O2 → 2H2O


– The mixture of H2 and O2 is an explosive mixture. The most explosive mixture is when the ratio of H2:O2 is 2:1 by volume.


Hydrogen reacts with copper oxide


– Hydrogen reacts with copper oxide at about 400 °C according to the equation:


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H2 + CuO → Cu+ H2O


– In the above PUHH, hydrogen has taken the place of oxygen in CuO. We say hydrogen is reducing.


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Applications of Hydrogen



  • As a fuel for rocket engines, an alternative engine fuel for gasoline.

  • Welding and cutting metal with oxygen-hydrogen torch.

  • As a raw material for the production of ammonium NH3, hydrochloric acid HCl and many organic compounds.

  • Used as a reducing agent to prepare metals from their oxides.

  • Used for hot air balloons.


Is hydrogen gas toxic?


Hydrogen is an extremely flammable gas, it reacts strongly with chlorine and fluorine, producing folic acid, which can affect the lungs and other parts of the human body.


Hydrogen gas, when mixed with oxygen, will also cause an explosion and catch fire. Or when an electric current passes through, Hydrogen can also explode.


However, it is colorless, tasteless and non-toxic hydrogen gas, so you can use it with confidence, just be careful with incidents when it comes into contact with other substances.


– Hydrogen gas is quite flammable, so the use of hydrogen gas to inflate bubbles or steam ports is to ensure safety. Instead, customers should choose helium because it is an inert gas, so it is safer.


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