H2O2 definition


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From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Hydrogen \Hy"dro*gen\, n. [Hydro-, 1 + -gen: cf. F.
     hydrog[`e]ne. So called because water is generated by its
     combustion. See {Hydra}.] (Chem.)
     A gaseous element, colorless, tasteless, and odorless, the
     lightest known substance, being fourteen and a half times
     lighter than air (hence its use in filling balloons), and

     over eleven thousand times lighter than water. It is very
     abundant, being an ingredient of water and of many other
     substances, especially those of animal or vegetable origin.
     It may by produced in many ways, but is chiefly obtained by
     the action of acids (as sulphuric) on metals, as zinc, iron,
     etc. It is very inflammable, and is an ingredient of coal gas
     and water gas. It is standard of chemical equivalents or
     combining weights, and also of valence, being the typical
     monad. Symbol H. Atomic weight 1.
     [1913 Webster]
     Note: Although a gas, hydrogen is chemically similar to the
           metals in its nature, having the properties of a weak
           base. It is, in all acids, the base which is replaced
           by metals and basic radicals to form salts. Like all
           other gases, it is condensed by great cold and pressure
           to a liquid which freezes and solidifies by its own
           evaporation. It is absorbed in large quantities by
           certain metals (esp. palladium), forming alloy-like
           compounds; hence, in view of quasi-metallic nature, it
           is sometimes called {hydrogenium}. It is the typical
           reducing agent, as opposed to oxidizers, as oxygen,
           chlorine, etc.
           [1913 Webster]
     {Bicarbureted hydrogen}, an old name for ethylene.
     {Carbureted hydrogen gas}. See under {Carbureted}.
     {Hydrogen dioxide}, a thick, colorless liquid, {H2O2},
        resembling water, but having a bitter, sour taste,
        produced by the action of acids on barium peroxide. It
        decomposes into water and oxygen, and is manufactured in
        large quantities for an oxidizing and bleaching agent.
        Called also {oxygenated water}.
     {Hydrogen oxide}, a chemical name for water, H?O.
     {Hydrogen sulphide}, a colorless inflammable gas, {H2S},
        having the characteristic odor of bad eggs, and found in
        many mineral springs. It is produced by the action of
        acids on metallic sulphides, and is an important chemical
        reagent. Called also {sulphureted hydrogen}.
        [1913 Webster]

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