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17 hours ago · The properties of ice vary substantially with temperature, purity and other factors. Ice is water that is frozen into a solid state, typically forming at or below temperatures of 0 ° C, 32 ° F, or 273.15 K. [4] As a naturally occurring crystalline inorganic solid with an ordered structure, ice is considered to be a mineral.
1 day ago · High-entropy alloy. Atomic structure model of fcc CoCrFeMnNi [1] High-entropy alloys ( HEAs) are alloys that are formed by mixing equal or relatively large proportions of (usually) five or more elements. Prior to the synthesis of these substances, typical metal alloys comprised one or two major components with smaller amounts of other elements.
5 days ago · Technology portal. v. t. e. A carbon nanotube ( CNT) is a tube made of carbon with a diameter in the nanometre range ( nanoscale ). They are one of the allotropes of carbon . Single-walled carbon nanotubes ( SWCNTs) have diameters around 0.5–2.0 nanometres, about 100,000 times smaller than the width of a human hair.
1 day ago · Ozone ( / ˈoʊzoʊn /) (or trioxygen) is an inorganic molecule with the chemical formula O. 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O. 2, breaking down in the lower atmosphere to O.
1 day ago · The hydrogen in ammonia is susceptible to replacement by a myriad substituents. Ammonia gas reacts with metallic sodium to give sodamide, NaNH 2. With chlorine, monochloramine is formed. Pentavalent ammonia is known as λ 5-amine, nitrogen pentahydride decomposes spontaneously into trivalent ammonia (λ 3-amine) and hydrogen gas at normal ...
5 days ago · The lanthanide ( / ˈlænθənaɪd /) or lanthanoid ( / ˈlænθənɔɪd /) series of chemical elements [a] comprises at least the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium. In the periodic table, they fill the 4f orbitals. [2] [3] [4] Lutetium (element 71) is also sometimes considered a ...
4 days ago · Hydrogen gas is produced by several industrial methods. Nearly all of the world's current supply of hydrogen is created from fossil fuels. [1] [2] : 1 Most hydrogen is gray hydrogen made through steam methane reforming. In this process, hydrogen is produced from a chemical reaction between steam and methane, the main component of natural gas.
