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- Chemical_formula abstract "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, 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 are more limiting than chemical names and structural formulas.The simplest types of chemical formulas are called empirical formulas, which use only letters and numbers indicating atomic proportional ratios (the numerical proportions of atoms of one type to those of other types). Molecular formulas indicate the simple numbers of each type of atom in a molecule of a molecular substance, and are thus sometimes the same as empirical formulas (for molecules that only have one atom of a particular type), and at other times require larger numbers than do empirical formulas. An example of the difference is the empirical formula for glucose, which is CH2O, while its molecular formula requires all numbers to be increased by a factor of six, giving C6H12O6.Sometimes a chemical formula is complicated by being written as a condensed formula (or condensed molecular formula, occasionally called a "semi-structural formula"), which conveys additional information about the particular ways in which the atoms are chemically bonded together, either in covalent bonds, ionic bonds, or various combinations of these types. This is possible if the relevant bonding is easy to show in one dimension. An example is the condensed molecular/chemical formula for ethanol, which is CH3-CH2-OH or CH3CH2OH. However, even a condensed chemical formula is necessarily limited in its ability to show complex bonding relationships between atoms, especially atoms that have bonds to four or more different substituents. Since a chemical formula must be expressed as a single line of chemical element symbols, it often cannot be as informative as a true structural formula, which is a graphical representation of the spacial relationship between atoms in chemical compounds (see for example the figure for butane structural and chemical formulas, at right). For reasons of structural complexity, there is no condensed chemical formula (or semi-structural formula) that specifies glucose (and there exist many different molecules, for example fructose and mannose, have the same molecular formula C6H12O6 as glucose). Linear equivalent chemical names exist that can and do specify any complex structural formula, but these names must use many terms (words), rather than the simple element symbols, numbers, and simple typographical symbols that define a chemical formula.Chemical formulas may be used in chemical equations to describe chemical reactions and other chemical transformations, such as the dissolving of ionic compounds into solution. While, as noted, chemical formulas do not have the full power of structural formulas to show chemical relationships between atoms, they are sufficient to keep track of numbers of atoms and numbers of electical charges in chemical reactions, thus balancing chemical equations so that these equations can be used in chemical problems involving conservation of atoms, and conservation of electric charge.".
- Chemical_formula thumbnail Aluminium_sulfate.jpg?width=300.
- Chemical_formula wikiPageID "7043".
- Chemical_formula wikiPageRevisionID "605670353".
- Chemical_formula data "160".
- Chemical_formula data "The pictured compound, aluminium sulfate, has a chemical formula Al23".
- Chemical_formula hasPhotoCollection Chemical_formula.
- Chemical_formula title "Al23".
- Chemical_formula subject Category:Chemical_formulas.
- Chemical_formula subject Category:Chemical_nomenclature.
- Chemical_formula subject Category:Notation.
- Chemical_formula comment "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, 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.".
- Chemical_formula label "Chemical formula".
- Chemical_formula label "Chemische Formel".
- Chemical_formula label "Formula chimica".
- Chemical_formula label "Fórmula química".
- Chemical_formula label "Fórmula química".
- Chemical_formula label "Molecuulformule".
- Chemical_formula label "Représentation des molécules".
- Chemical_formula label "Symbolika chemiczna".
- Chemical_formula label "Химическая формула".
- Chemical_formula label "صيغة كيميائية".
- Chemical_formula label "化学式".
- Chemical_formula label "化学式".
- Chemical_formula sameAs Chemický_vzorec.
- Chemical_formula sameAs Chemische_Formel.
- Chemical_formula sameAs Χημικός_τύπος.
- Chemical_formula sameAs Fórmula_química.
- Chemical_formula sameAs Formula_kimiko.
- Chemical_formula sameAs Représentation_des_molécules.
- Chemical_formula sameAs Rumus_kimia.
- Chemical_formula sameAs Formula_chimica.
- Chemical_formula sameAs 化学式.
- Chemical_formula sameAs 화학식.
- Chemical_formula sameAs Molecuulformule.
- Chemical_formula sameAs Symbolika_chemiczna.
- Chemical_formula sameAs Fórmula_química.
- Chemical_formula sameAs m.020j3.
- Chemical_formula sameAs Q83147.
- Chemical_formula sameAs Q83147.
- Chemical_formula wasDerivedFrom Chemical_formula?oldid=605670353.
- Chemical_formula depiction Aluminium_sulfate.jpg.
- Chemical_formula isPrimaryTopicOf Chemical_formula.
