3 天之前 · hydrogen (H), a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements. The hydrogen atom has a nucleus …

3 天之前 · Hydrogen - Reactivity, Uses, Properties: One molecule of hydrogen dissociates into two atoms (H2 → 2H) when an energy equal to or greater than the dissociation energy (i.e., …

It is used to synthesize ammonia, ethanol, aniline, and methanol; to treat petroleum fuels; as a reducing agent (see reduction) and to supply a reducing atmosphere; to make hydrogen …

Hydrogen makes up less than 1 percent of Earth’s crust, but it is part of all the water on Earth. It is also one of the gases that makes up Earth’s atmosphere. It is in the tissues of all plants and …

2024年12月13日 · hydrogen peroxide, (H 2 O 2), a colourless liquid usually produced as aqueous solutions of various strengths, used principally for bleaching cotton and other textiles and …

2025年1月4日 · hydrogen cyanide, a highly volatile, colourless, and extremely poisonous liquid (boiling point 26° C [79° F], freezing point-14° C [7° F]). A solution of hydrogen cyanide in …

Hydrogen is the lightest element because it is composed of only two particles—the smallest number that can form a neutral atom. Its nucleus consists of a single proton bearing a positive …

2025年1月13日 · Corresponding compounds of the hydrogen isotopes differ slightly in their physical properties. This difference is shown by the properties of the waters, listed in the …

2025年1月13日 · Hydrogen has been used as a primary rocket fuel for combustion with oxygen or fluorine and is favoured as a propellant for nuclear-powered rockets and space vehicles. …

2024年12月27日 · Hydrogen chloride, a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. Its chemical formula is HCl. A solution of the gas in water …