Writing and naming chemical compounds

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Writing and naming chemical compounds

This convention should also be applied to all compounds and derivative names of these chemicals: Capitalization of elements and compounds[ edit ] In former versions of the IUPAC recommendations, names were written with a capital initial letter.

This practice has been abandoned in later publications. They are capitalized at the beginning of a sentence or title, but not elsewhere. Note that for chemical elements this applies to the word only and not the chemical symbol, which is always capitalized.

Both rules remain even with chemical elements derived from proper names which would otherwise be capitalized, in keeping with IUPAC policy to differentiate proper names from things named after proper names. Thus, it is californium but the symbol is Cf, and einsteinium, but symbol Es.

Note that names for odd or rare chemicals are uncapitalized like common ones, and thus uranium and plutonium symbols U and Pu should be uncapitalized like carbon or iron symbols C and Fe.

This rule full name uncapitalized but symbol capitalized applies also to isotopes and nuclides, when completely written out: The element mercury is uncapitalized, but of course the planet and god Mercury remain capitalized proper nouns.

Likewise, the names of chemical compounds are considered common nouns which are capitalized at the beginning of a sentence or title, but not elsewhere.

Exceptions are cyclo, iso, neo, and spiro which are considered part of the name and therefore not italicized or hyphenated. Substituent groups do form part of the name: Note that in this case the two wikilinks refer to separate redirects to the actual article. The article title itself is capitalized.

A redirect from the uncapitalized version should be created to simplify linking from other articles. Non-numerical prefixes are italicized and uncapitalized in titles tert-Butyl alcohol, for example. Both numerical and non-numerical prefixes are followed by a hyphen.

Note that cyclo, iso, neo, and spiro are considered part of a chemical name such as isopropanol and not considered prefixes. No hyphens or italics are used in these cases. Use of Stock nomenclature[ edit ] Stock nomenclature for inorganic compounds is based on the indication of the oxidation number as a roman numeral, in parentheses of each of the major elements in the compound, e.

It is widely, if sometimes incorrectly, used on Wikipedia for the titles of articles about inorganic compounds. It is not obligatory, as there are other acceptable methods for naming these compounds, but it is often preferred as the most common non-ambiguous name for a substance.

The following guidelines are based on current WikiBestPractice: Only the cationic element i. Except in rare cases none at presentwe do not assign the oxidation number in the anion: There is no space between the end of the element name and the opening parenthesis: Note that this is an exception to the usual English style for parentheses.

It is not necessary to specify the oxidation number when there is no possibility of ambiguity in the compound title: Stock nomenclature should only be used for ionic compounds. Compounds with a substantial degree of covalency should be named by stoichiometric nomenclature: Stock nomenclature should not be used for compounds with mixed or non-integral oxidation numbers: Isotope labelling[ edit ] Isotopes when written out are common nouns, and should begin with the uncapitalized element name, followed by a hyphen not an em dash or en dash and then the mass number.

Steps for Writing the Formula of a Inorganic Salt Given Its Name

Examples are carbon and uranium The uncapitalized name of elements when written out but not in symbol form follows IUPAC convention for chemical elements, and is not changed when the isotope is written out.

For example, 14C or 18F. You may use a nuclide template. Deuterium and tritium may be labelled "D", "2D", or "2H" and so on. Deuterated solvents for NMR use are customarily described variously as: These established systems are all acceptable, but should remain consistent within an article.

writing and naming chemical compounds

Exceptions would be where the pharmaceutical use of a certain compound is secondary to other applications commodity chemical, synthetic intermediate, etc. Exceptions[ edit ] Even with the best will in the world, no set of guidelines can cover every case.

Some articles on Wikipedia have non-standard titles through consensus that this is the most commonly used name in scientific circumstances for the compound concerned, whatever IUPAC or the other rules suggest.

Groups of compounds[ edit ] Organic functional groups and related compound classes[ edit ] For articles about functional groups, the singular class name from the IUPAC "Glossary of Class Names" [5] is usually used, e.Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion).

Covalent compounds are formed when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds containing hydrogen are also usually covalent compounds. Chemical formula writing worksheet with answers Over compounds to solve. Simple binary ionic compounds to polyatomic compounds.

Printable pdf file. Students should also have a Periodic table. In chemical formulas the less electronegative atom is usually written first and the more electronegative atom is usually written last, eg, H2O, BaBr2, AlF3, SO2, etc.

Exceptions include NH3, CH4, and other organic compounds. General Information Scientist all around the globe use a standard method for naming chemical compounds.

The standards were set up by an international committee sponsored by the IUPAC.

Naming Chemical Compounds & Writing Chemical Formulas

Chemical Formula Writing The procedure that can be followed when confronted with the name of a compound and you wish to write its formula is as follows: Identify the symbol of the cation (first part of the name) and the anion.

Chemical Compounds Practice Quiz This online quiz is intended to give you extra practice in naming compounds, writing formulas and calculating molar masses (formula weights). Select your preferences below and click 'Start' to give it a try!

Naming Chemical Compounds & Writing Chemical Formulas