Compound: Hydrogen
SMILES: [H][H]
InChIKey: UFHFLCQGNIYNRP-UHFFFAOYSA-N
Synonyms: Hydrogen, Molecular hydrogen, Dihydrogen, 1333-74-0, Protium, hydrogen-1, DTXSID9029643, 7YNJ3PO35Z, CHEBI:18276, Hydrogen atoms, RefChem:389053, DTXCID00196437, 215-605-7, H, Atomic hydrogen, Hydrogen gas, H2, Hydrogen in Steel, 1g/piece, 1-Butanol, titanium(4+) salt, monohydrate, homopolymer (9CI), Hydrogen, atomic, H in Stainless Steel, 1g Balls of O 6.35 mm, hidrogeno, hydrogene, Wasserstoff, o-Hydrogen, p-Hydrogen, hydrogen molecule, monoatomic hydrogen, 3A molecular sieve, HYDROGEN [HSDB], alpha-Cellulose, 90mum, HYDROGEN [MI], T101 Monoclonal Antibody, HYDROGEN [WHO-DD], COware 20ml with H-Caps, Hydrogen in stainless steel, Hydrogen, >=99.99%, Hydrogen, >=99.999%, SCHEMBL29349524, SCHEMBL29357126, CHEBI:18140, CHEBI:33251, YZCKVEUIGOORGS-UHFFFAOYSA-N, BBL103822, NSC356464, STL557632, alpha-Cellulose, 25mum particle size, alpha-Cellulose, 65mum particle size, AKOS016038407, Hydrogen in Steel, 1g/ball, 20 pcs, NSC-356464, UN 1049, UN 1966, E949, Hydrogen, Messer(R) CANgas, 99.999%, E 949, E-949, NS00080750, C00282, alpha-Cellulose, Partical size: d50,180-280mum, alpha-Cellulose, Partical size: d50,90-150mum, H in Stainless Steel, 1g Stick of O 3.8x12 mm, H in Stainless Steel, 1g Stick of O 4.1x10 mm, Q3027893, Hydrogen in Aluminum, 10 rods 0.5" diameter x 24", 1-Butanol,titanium(4+)salt,monohydrate,homopolymer(9ci), 12184-90-6, 1H, H-H
Theoretical properties:
molecular_formula: H2
molecular_weight: 2.016 g/mol
exact_mass: 2.0156500638 g/mol
formal_charge: 0
hydrogen_bond_donor_count: 0
hydrogen_bond_acceptor_count: 0
rotatable_bond_count: 0
heavy_atom_count: 0
isotope_atom_count: 0
covalently_bonded_unit_count: 1
Physical properties:
physical_state: Colorless gas
color: Colorless gas
odor: Odorless
boiling_point: -423 °F at 760 mmHg (USCG, 1999)
melting_point: -434 °F (USCG, 1999)
density: 0.071 at -423.4 °F (USCG, 1999) - Less dense than water; will float
solubility: In water, 1.62 mg/L at 21 °C
flash_point: Flammable gas
vapor_pressure: 1.24X10+6 mm Hg at 25 °C
Descriptions:
{"pubchem": "Dihydrogen is an elemental molecule consisting of two hydrogens joined by a single bond. It has a role as an electron donor, an antioxidant, a fuel, a human metabolite and a member of food packaging gas. It is a gas molecular entity, an elemental molecule and an elemental hydrogen.", "chebi": "An elemental molecule consisting of two hydrogens joined by a single bond.", "chembl": null, "wikipedia": "Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible. Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas H2 (dihydrogen) and in molecules, such as in water and organic compounds. The most common isotope of hydrogen, 1H, consists of one proton, one electron, and no neutrons.\nHydrogen gas was first produced artificially in the 17th century by the reaction of acids with metals. Henry Cavendish, in 1766\u20131781, identified hydrogen gas as a distinct substance and discovered its property of producing water when burned: this is the origin of hydrogen's name, which means 'water-former' (from Ancient Greek: \u1f55\u03b4\u03c9\u03c1, romanized: h\u00fad\u014dr, lit.\u2009'water', and \u03b3\u03b5\u03bd\u03bd\u03ac\u03c9, genn\u00e1\u014d, 'I bring forth'). Understanding the colors of light absorbed and emitted by hydrogen was a crucial part of the development of quantum mechanics.\nHydrogen, typically nonmetallic except under extreme pressure, readily forms covalent bonds with most nonmetals, contributing to the formation of compounds like water and various organic substances. Its role is crucial in acid\u2013base reactions, which mainly involve proton exchange among soluble molecules. In ionic compounds, hydrogen can take the form of either a negatively-charged anion, where it is known as hydride, or as a positively charged cation, H+, hydron. Although tightly bonded to water molecules, hydrons strongly affect the behavior of aqueous solutions, as reflected in the importance of pH. Hydride, on the other hand, is rarely observed because it tends to deprotonate solvents, yielding H2.\nIn the early universe, neutral hydrogen atoms formed about 370,000 years after the Big Bang as the universe expanded and plasma had cooled enough for electrons to remain bound to protons. After stars began to form, most of the hydrogen in the intergalactic medium was re-ionized.\nNearly all hydrogen production is done by transforming fossil fuels, particularly steam reforming of natural gas. It can also be produced from water or saline by electrolysis, but this process is more expensive. Its main industrial uses include fossil fuel processing and ammonia production for fertilizer. Emerging uses for hydrogen include the use of fuel cells to generate electricity."}