| slovo | definícia |
C2H4O
(gcide) | Aldehyde \Al"de*hyde\ ([a^]l"d[-e]*h[imac]d), n. [Abbrev. fr.
alcohol dehydrogenatum, alcohol deprived of its hydrogen.]
1. (Chem.) A colorless, mobile, and very volatile liquid
obtained from alcohol by certain processes of oxidation.
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2. (Chem.) Any compound having the group -CHO. Methyl
aldehyde, the simplest aldehyde, is more commonly called
formaldehyde, H-CHO, and acetic aldehyde is now more
commonly called acetaldehyde. The higher aldehydes may
be solids. A reducing sugar typically contains the
aldehyde group.
[PJC]
Note: The aldehydes are intermediate between the alcohols and
acids, and differ from the alcohols in having two less
hydrogen atoms in the molecule, as common aldehyde
(called also acetaldehyde, acetic aldehyde or
ethyl aldehyde), C2H4O; methyl aldehyde (called
also formaldehyde), CH2O.
[1913 Webster +PJC]
Aldehyde ammonia (Chem.), a compound formed by the union of
aldehyde with ammonia.
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| | podobné slovo | definícia |
C2H4O2
(gcide) | Formula \For"mu*la\, n.; pl. E. Formulas, L. Formul[ae].
[L., dim. of forma form, model. SeeForm, n.]
1. A prescribed or set form; an established rule; a fixed or
conventional method in which anything is to be done,
arranged, or said.
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2. (Eccl.) A written confession of faith; a formal statement
of foctrines.
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3. (Math.) A rule or principle expressed in algebraic
language; as, the binominal formula.
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4. (Med.) A prescription or recipe for the preparation of a
medicinal compound.
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5. (Chem.) A symbolic expression (by means of letters,
figures, etc.) of the constituents or constitution of a
compound.
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Note: Chemical formul[ae] consist of the abbreviations of the
names of the elements, with a small figure at the lower
right hand, to denote the number of atoms of each
element contained.
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Empirical formula (Chem.), an expression which gives the
simple proportion of the constituents; as, the empirical
formula of acetic acid is C2H4O2.
Graphic formula, Rational formula (Chem.), an expression
of the constitution, and in a limited sense of the
structure, of a compound, by the grouping of its atoms or
radicals; as, a rational formula of acetic acid is
CH3.(C:O).OH; -- called also structural formula,
constitutional formula, etc. See also the formula of
Benzene nucleus, under Benzene.
Molecular formula (Chem.), a formula indicating the
supposed molecular constitution of a compound.
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C2H4OH2
(gcide) | Glycol \Gly"col\, n. [Glycerin + -ol. See Glycerin.] (Chem.)
(a) A thick, colorless liquid, C2H4(OH)2, of a sweetish
taste, produced artificially from certain ethylene
compounds. It is a diacid alcohol, intermediate between
ordinary ethyl alcohol and glycerin.
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