An index to chemical information on the Internet, with structures and physical properties, searchable by name, structure, CAS Number, and physical properties.

Search for Species Data by Chemical Formula ... Chemical Formula Search Help ... Rules for chemical formulas (Back to search)

Chemical formulas such as HClO4 can be divided into empirical formula, molecular formula, and structural formula.

Abbreviations of Chemical Compounds ... Chemical Nomenclature ... Chemical Name Searching; Abbreviations of Chemical Compounds; Chemical Nomenclature;

(Remember a subscript one is understood and not written in compound formulas.) ... Ignore the oxidation numbers and write the formulas of the ions. Always write the positive ion first.; For example:

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Chemical Information Resources pointing to biomedical information, ChemIDplus structure/name file, HSDB structure file, NCI3D Structure file, search by name, struucture, substructure with hyperlinked ...

Enter a Chemical Name, CAS Registry Number, Molecular Formula or Weight. Use * for partial names (e.g. aceto*). Search Tips » ... Search by Structure

This lesson will concentrate on writing simple chemical formulas when given a formula name.

SparkNotes online free test prep ... If you need more than one of them, enclose them in parentheses when you write formulas. You need to know their names, formulas, and charges.