chemical formula

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formula

 [for´mu-lah] (pl. formulas, for´mulae) (L.)
1. an expression, using numbers or symbols, giving the directions for preparing a compound (such as a medicine) or giving a procedure to follow to obtain a desired result.
2. a mixture for feeding an infant, usually with cow's milk as a base, supplemented with vitamins and minerals. Various formulas are available, differing in protein, fat, and carbohydrate content in order to meet the nutritional requirements or restrictions of individual infants.
chemical formula a combination of symbols used to express the chemical components of a substance.
empirical formula a chemical formula that expresses the proportions of the elements present in a substance.
molecular formula a chemical formula expressing the number of each element present in a substance, without indicating how they are linked.
spatial formula (stereochemical formula) a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.

chem·i·cal for·mu·la

a statement of the structure of a molecule expressed in chemical symbols.

formula

(for'myu-la) [L. formula, a register]
1. A rule prescribing ingredients and proportions for the preparation of a compound.
2. In chemistry, a symbolic expression of the constitution of a molecule. It consists of the symbols of its component elements, each denoting one atom, with subscripted numbers denoting the number of atoms present. Water, or H2O, consists of two molecules of the element hydrogen and one of oxygen. It may also be written HOH.

Collections of atoms that constitute a group by themselves (radical) are often separated by periods or parentheses. In this case, figures prefixed or appended to the parentheses, or prefixed to an expression contained within periods, apply to all the symbols embraced by the parentheses or periods. In all other cases, a figure prefixed to a symbolic expression for a molecule, such as a coefficient in an algebraic formula, is a multiplier of all the symbols following.

3. Any liquid diet containing variable amounts of protein, fat, carbohydrate, vitamins, and minerals administered to infants as an alternative or a supplement to breast milk.

Arneth's formula

An obsolete method of estimating the number of immature leukocytes by means of an elaborate differential blood count, on the basis of their shape and the number of lobes in the nucleus.

chemical formula

See: formula (2)

dental formula

A brief method of expressing the dentition of mammals in which the numbers of the teeth are given in the form of a fraction, each portion representing one quadrant; the numbers of the upper teeth form the numerator, and those of the lower teeth the denominator.

The first number listed represents the incisors; the second, the canines; the third, the premolars; and the fourth, the molars. The dental formula of the upper and lower right half of the mouth in humans is

empirical formula

A chemical formula that indicates the simplest numerical ratio of the elements within a molecule, without demonstrating the molecule's chemical bonds or structure. For example, the empirical formula for water is H2O. Synonym: molecular formula

molecular formula

Empirical formula.

official formula

A formula in a pharmacopeia.

spatial formula

Stereochemical formula.

stereochemical formula

A method of depicting chemical formulas so that the elements and their number are depicted as well as their position in space in relation to each other. Synonym: spatial formula

structural formula

A formula of a compound that shows the relationship of the atoms in a molecule. The atoms are shown joined by valence bonds (e.g., H-O-H) as opposed to the empirical formula (H2O).

formula

pl. formulae, formulas [L.] an expression, using numbers or symbols, of the composition of, or of directions for preparing, a compound, such as a medicine, or of a procedure to follow to obtain a desired result, or of a single concept.

chemical formula
a combination of symbols used to express the chemical components of a substance.
dental formula
see dental formula.
empirical formula
a chemical formula that expresses the proportions of the elements present in a substance.
gait formula
sets out the times that the feet are individually in contact with the ground while the animal is moving.
molecular formula
a chemical formula expressing the number of atoms of each element present in a substance, without indicating how they are linked.
spatial formula, stereochemical formula
a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula
a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.
vertebral formula
sets out the number of vertebrae in each of the sections of the spinal column.
References in periodicals archive ?
From the general formula of the Ehrhart polynomial for a cube, which is L(P, t) = (t + 1[).
One possibility under consideration is to drop the effort to agree on a general formula for cutting tariffs and subsidies, known in trade jargon asAa "modalities," and go straight intoAa "scheduling" - negotiating cuts in import duties and other moves on a bilateral basis.
The general formula giving analogous series for all [zeta](2s+3), s [greater than or equal to] 0, was proved by Koecher [7] (and independently in an expanded form by Leshchiner [9].
Some processes of ensuring variety in math skill levels include: becoming familiar with physics formulas and contextual problems, which are often technically correct in an applied context compared to pure math contexts: mathematical transposing can serve the teacher well as problems often involve mathematical computations from a general formula, but actual problems require solving from many different aspects: and acquiring accurate and authentic physics resources.
To our knowledge, a general formula does not exist which allows obtain them.
Farber, Gillet and Szafarz (2006) propose a general formula for the WACC in which the expected return on the tax shield appears explicitly.
The general formula of home audio being found primarily on electronics retail floors does not apply to thin category, as these products are showing up in greater numbers in specialty home furnishings stores, department stores and mass merchants.
The European Council, on 14-15 December, retreated from explicit mention of solutions to the currently cumbersome decision-making put forward "notably in the Constitutional Treaty" to a more general formula concerning principles acknowledged in the context of the "Union's reform process" (see Europolitics 3209).
EQUATION 1 is a general formula, including lossy cases, for transmission line impedance (Z0).
Bayer Corporation (Tarrytown, NY) has patented a chemiluminescent substrate of a hydrolytic enzyme having the following general Formula I is disclosed, as follows: Lumi-M-PFormula I where "Lumi" is a chemiluminescent moiety capable of producing light (a) by itself, (b) with MP attached and (c) with M attached.
Money given to pay off the interest on capital projects ( which was previously kept in a separate fund ( has now been included in each council's general formula grant.
With the same general formula, it takes little time to find the very reasonable, probably valid Trochastrites HOHNENSIS (a fossil), a tropical American mosquito specified ININENSIS (presumably from Inini in French Guiana), Murex ELENENSIS (a snail), Begonia URUNENSIS (a fossil shark), and Cetiosaurus OXONENSIS (a small British dinosaur).

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