H4

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Solomon Islands    has the mark    H4 Misc > Aircraft Registration Marks

(NH4)2CO3    is    Ammonium Carbonate Aka: Sal Volatile. When crushed is used as smelling salts. Science & Nature > Chemical Formulae

CH4    is the chemical formula of    Methane Marsh gas; methyl hydride; natural gas Science & Nature > Alkanes

CH4    is    Methane The principal component of natural gas. The relative abundance of methane and its clean burning process makes it a very attractive fuel. However, because it is a gas at normal temperature and pressure, methane is difficult to transport Science & Nature > Chemical Formulae

C21H44    is the chemical formula of    N-Heneicosane Science & Nature > Alkanes

C19H40    is the chemical formula of    N-Nonadecane Science & Nature > Alkanes

C23H48    is the chemical formula of    N-Tricosane Science & Nature > Alkanes

C2H4O2    is    Acetic Acid An organic chemical compound that gives vinegar its sour taste and pungent smell. Also known as ethanoic acid. Science & Nature > Chemical Formulae

C22H46    is the chemical formula of    N-Docosane Science & Nature > Alkanes

C20H42    is the chemical formula of    N-Eicosane Didecyl Science & Nature > Alkanes