molecular 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.

em·pir·ic for·mu·la

in chemistry, a formula indicating the kind and number of atoms in the molecules of a substance, or its composition, but not the relation of the atoms to each other or the intimate structure of the molecule.
Synonym(s): molecular formula

molecular formula,

n a representation of the numbers of all elements that comprise one molecule of a compound.

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 ?
new Complete Molecular Confidence[TM] solution for small molecule molecular formula determination by SmartFormula 3D followed by NMR automated structure verification,
The first offers access to important information about patents, structures, molecular formulas, physical/chemical properties and more.
Chapter 2 covers rules of chemical bonding, functional groups, chemical nomenclature and molecular formulas.
This information can be related to many important chemical phenomena such as the determinations of molecular weight, degrees of ionization and the relationships between empirical and molecular formulas.
Each of these profiles includes information on Chemical Abstract Service (CAS) numbers, European Inventory of Existing Commercial Chemical Substances/European List of Notified Chemical Substances (EINECS/ELINCS) numbers, UN/DOT reference numbers, FEMA numbers, classification, definition, chemical synonyms, empirical and molecular formulas, properties, toxicology, precautions, storage, use, use level, regulatory details, manufacturers and distributors, and trade name synonyms.
For generating molecular formulas, five font sets capable of generating several dozen characters and geometrical constructs are available on the optional Chemical Fonts Disk.
Each monograph entry contains information including the following: CAS, EINECS/ELINCS, and UN/DOT reference numbers, classification, definition, chemical synonyms, empirical and molecular formulas, properties, toxicology, precautions, storage, uses, use level, regulatory details, manufacturers and distributors.
More flash points, as well as molecular formulas, lower and upper explosive limits, autoignition temperatures, and NFPA-type (Red) numerical fire codes
It contains 4,174 chemical entries and information on their structures, molecular formulas, and chemical names, and provides synonyms for each chemical, as well as other identifiers, trade names, and trivial names, in English and other languages.
CAS (Chemical Abstract Service), EINECS/ELINCS (European Inventory of Existing Commercial Chemical Substances/European List of Notified Chemical Substances), and UN/DOT reference numbers, classification, definition, chemical synonyms, trade name synonyms (including manufacturers), empirical and molecular formulas, properties, toxicology, precautions, storage, uses, use level, regulatory details, manufacturers and distributors.

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