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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...
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Hydrogen peroxide is a
chemical compound with the
formula H2O2. In its pure form, it is a very pale blue
liquid that is
slightly more
viscous than water...
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Hydrogenation is a
chemical reaction between molecular hydrogen (H2) and
another compound or element,
usually in the
presence of a
catalyst such as nickel...
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Hydrogen sulfide is a
chemical compound with the
formula H2S. It is a
colorless chalcogen-hydride gas, and is toxic, corrosive, and flammable.
Trace amounts...
- In chemistry, a
hydrogen bond (H-bond) is a
specific type of
molecular interaction that
exhibits partial covalent character and
cannot be
described as...
- of
hydrogen Hydrogen atom,
about the
physics of
atomic hydrogen Hydrogen ion
Hydron (chemistry), a.k.a. "proton" or "
hydrogen"
Isotopes of
hydrogen Hydrogen-2...
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Hydrogen cyanide (formerly
known as
prussic acid) is a
chemical compound with the
formula HCN and
structural formula H−C≡N. It is a
highly toxic and flammable...
-
compound with the
chemical formula CH4 (one
carbon atom
bonded to four
hydrogen atoms). It is a group-14 hydride, the
simplest alkane, and the main constituent...
- as
acidity or basicity,
historically denotes "potential of
hydrogen" (or "power of
hydrogen"). It is a
logarithmic scale used to
specify the
acidity or...
- The
compound hydrogen chloride has the
chemical formula HCl and as such is a
hydrogen halide. At room temperature, it is a
colorless gas,
which forms white...
