What are three physical properties of hydrogen?
Physical properties of hydrogen
- melting temperature — (-259.2) degrees Celsius;
- boiling temperature — (-252.76) degrees Celsius;
- in this interval, hydrogen is a colorless liquid without any smell;
- at high pressure, snow-like crystals of solid hydrogen form;
At standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H2. Hydrogen is also prevalent on Earth in the form of chemical compounds such as hydrocarbons and water.
- Atomic hydrogen is very reactive. It combines with most elements to form hydrides (e.g., sodium hydride, NaH), and it reduces metallic oxides, a reaction that produces the metal in its elemental state. Almost all metals and nonmetals react with hydrogen at high temperatures.
- It is a nontoxic, odorless, colorless gas that naturally exists in our Universe. Being the first element on the periodic table, Hydrogen is the lightest of all chemical elements. Interesting Hydrogen Facts: Majority of the Universe's mass (75%) is comprised of Hydrogen.
- Hydrogen gas is very flammable and yields explosive mixtures with air and oxygen. The explosion of the mixture of hydrogen and oxygen is quite loud. Tests should be made prior to the demonstration to adjust the total volume in the balloons so that the sound of the explosion is tolerable in the room.
A hydrogen atom contains one proton, and only one electron . Pure hydrogen exists as hydrogen gas, in which pairs of hydrogen atoms bond together to make molecules. Dihydrogen is a colourless, odourless, tasteless, combustible gas. It is lighter than air and insoluble in water.
- Hydrogen bonding is important because it is crucial to all life on Earth. Here are three reasons why hydrogen bonding is important. DNA has a double-helix structure because hydrogen bonds hold together the base pairs in the middle. Without hydrogen bonds, DNA would have to exist as a different structure.
- Helium has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can explioit these properties. Helium was the first gas used for filling balloons and dirigibles.
- Helium gas is used to inflate blimps, scientific balloons and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets and in supersonic windtunnels.
Updated: 28th November 2019