hydrogen gas; the chemical element [[氢|氫|qing1]] which is the lightest known gas, colorless, odorless, and highly flammable

hydrogen bomb; H-bomb; a powerful nuclear weapon that uses nuclear fusion of hydrogen isotopes; also called [[热核武器|熱核武器|re4 he2 wu3 qi4]]

hydrogen peroxide; a chemical compound with the formula H2O2

sodium hydroxide; caustic soda; NaOH

the chemical process of adding hydrogen to a compound

an enzyme that removes hydrogen from a molecule

hydrogen sulfide; H2S; a colorless, toxic, foul-smelling gas used in chemical analysis to separate and identify metal ions

sodium bicarbonate; baking soda

hydrofluoric acid; a solution of hydrogen fluoride in water

atom of the chemical element hydrogen

Any organic compound consisting entirely of hydrogen and carbon, such as those found in petroleum and natural gas; also called [[烃|烴|ting1]].

chemical bond in which a hydrogen atom provides a bridge between two electronegative atoms

(chemistry) to remove hydrogen from a chemical compound

a chemical compound formed by hydrogen and another element, usually a more metallic element

calcium hydroxide Ca(OH)2; slaked lime

an inorganic compound with the chemical formula KOH; commonly known as caustic potash

heavy hydrogen; an isotope of hydrogen with a symbol of D or 2H; its nucleus contains one proton and one neutron, making it approximately twice as heavy as ordinary hydrogen; also known as [[氘|氘|dao1]]

inorganic chemical compound containing a hydroxyl group bonded to a metal or non-metal element

A colorless gas with a pungent odor that dissolves in water to form [[盐酸|鹽酸|yan2 suan1]]; used in the production of hydrochloric acid and vinyl chloride.

hydrogen fluoride; hydrofluoric acid

The extremely high-temperature flame produced by burning a mixture of hydrogen and oxygen; used for welding metals or quartz.

(chemistry) a chemical group consisting of one hydrogen atom and one oxygen atom; also called [[羟基|羥基|qiang3 ji1]] or [[氢氧根|氫氧根|qing1 yang3 gen1]]

to add hydrogen to a chemical element or compound, or the process of doing so

dihydrotestosterone; an androgen hormone and metabolite of testosterone

Tetrahydrocannabinol, also known as THC

hydrocyanic acid; hydrogen cyanide

An acid consisting of hydrogen and a halogen, such as [[氢氟酸|氫氟酸|qing1 fu2 suan1]] or [[盐酸|鹽酸|yan2 suan1]]

a mixture of hydrogen and oxygen gas, typically in a ratio of 2:1, used in high-temperature torches for welding and cutting

(bound form) hydroxide; the chemical suffix used to indicate a hydroxide of a specific element

magnesium hydroxide; Mg(OH)2

the hydroxide radical or hydroxyl group (-OH) consisting of one oxygen atom and one hydrogen atom

hydroxide ion OH-

an inorganic strong acid with the chemical formula HCl, used widely in industrial processes and as a reagent in laboratories

hydrobromic acid; HBr

A functional group consisting of a hydrogen atom and a sulfur atom; also known as [[巯基|巰基|qiu2 ji1]] or [[硫醇基|硫醇基|liu2 chun2 ji1]].

energy derived from using hydrogen as a fuel

hydrogenase; a type of enzyme that catalyzes the oxidation of molecular hydrogen or the reduction of protons

thermonuclear weapon or hydrogen bomb, specifically a three-stage fission-fusion-fission weapon

hydrocarbon; any organic compound consisting entirely of hydrogen and carbon

bicarbonate ion or radical in chemistry

hydrocarbonate; a chemical compound containing the [[碳酸氢根|碳酸氫根|tan4 suan1 qing1 gen1]] ion, such as baking soda

glucose-6-phosphate dehydrogenase deficiency, a genetic condition that causes red blood cells to break down in response to certain triggers such as fava beans or infections

an isotope of hydrogen with two neutrons and one proton, primarily used in thermonuclear reactions; also called [[氚|氚|chuan1]]

catalase; an enzyme that catalyzes the decomposition of hydrogen peroxide into water and oxygen; also known as hydrogen peroxidase