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chemical formula

Babylon English English dictionary

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chemical formula
combination of symbols representing the composition of a chemical substance

Wikipedia English The Free Encyclopedia

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Chemical formula
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (-) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a chemical name, and it contains no words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Chemical formulas can fully specify the structure of only the simplest of molecules and chemical substances, and are generally more limited in power than are chemical names and structural formulas.

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WordNet 2.0 Dictionary

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chemical formula

1. a representation of a substance using symbols for its constituent elements
(synonym) formula
(hypernym) statement
(hyponym) molecular formula
(part-meronym) chemical notation

Mineralogy Database Dictionary

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Chemical Formula

The format for the chemical formula is based on the reported formula from the literature source for the mineral. In many cases, the formula is base on the structural interpretation of the mineral, especially the silicates.

The chemical formula is closely matched to the mineral's crystallographic unit cell dimensions and "Z" value.

Special symbols are used where a hole (vacancy) is present in the formula. For this database, the "[ ]" square brackets are used to signify this vacancy.
e.g.: ([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Rare Earth Elements in mineral formulae are denoted by the symbol REE.
e.g.: (Na3(Ca,REE,Sr)3(CO3)5)

General Chemistry Glossary

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molecular formula (formula; chemical formula)
Compare with empirical formula .A notation that indicates the type and number of atoms in a molecule. The molecular formula of glucose is C6H12O6, which indicates that a molecule of glucose contains 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.

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