Search results
Results from the WOW.Com Content Network
The check digit is found by taking the last digit times 1, the preceding digit times 2, the preceding digit times 3 etc., adding all these up and computing the sum modulo 10. For example, the CAS number of water is 7732-18-5: the checksum 5 is calculated as (8×1 + 1×2 + 2×3 + 3×4 + 7×5 + 7×6) = 105; 105 mod 10 = 5.
This is a list of CAS numbers by chemical formulas and chemical compounds, indexed by formula.The CAS number is a unique number applied to a specific chemical by the Chemical Abstracts Service (CAS).This list complements alternative listings to be found at list of inorganic compounds and glossary of chemical formulae
Built into every CAS number is a check-digit that makes it possible to detect mis-typed numbers. Validation is a mathematical and repetitive process well-suited for software. Note that a validated CAS number can still be absent from the CAS database; mathematical validation only says that a CAS number could be valid based on its format.
This is the only sublayer that must occur in every InChI. Numbers used throughout the InChI are given in the formula's element order excluding hydrogen atoms. For example, "/C10H16N5O13P3" implies that atoms numbered 1–10 are carbons, 11–15 are nitrogens, 16–28 are oxygens, and 29–31 are phosphorus. [11] Atom connections (prefix: "c ...
Note: There are elements for which spellings may differ, such as aluminum/aluminium, sulfur/sulphur, and caesium/cesium. ... CAS number ErCl 3: erbium(III) chloride ...
The CAS No. (that is, "CAS Registry Number" [1]) in a Chembox will receive a green tick (check mark) once {} is added. This does not happen yet in the Drugbox (there is no change at present), but we hope to enable a similar system there too, if WP:PHARM is in agreement.
Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO 2.The mineral form of SnO 2 is called cassiterite, and this is the main ore of tin. [9]
Two earlier group number systems exist: CAS (Chemical Abstracts Service) and old IUPAC. Both use numerals (Arabic or Roman) and letters A and B. Both systems agree on the numbers. The numbers indicate approximately the highest oxidation number of the elements in that group, and so indicate similar chemistry with other elements with the same ...