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Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.
If there are multiple functional groups of the same type, either prefixed or suffixed, the position numbers are ordered numerically (thus ethane-1,2-diol, not ethane-2,1-diol.) The N position indicator for amines and amides comes before "1", e.g., CH 3 CH(CH 3)CH 2 NH(CH 3) is N,2-dimethylpropanamine.
S4NGA = 50 × M11A2 Practice HEAT Rifle Grenades packed in fiberboard storage tubes in a wooden crate with 5 metal M13 Grenade Launcher Assortment ammo cans (1 carton of 10 × .30-'06 Grenade Blank M3 cartridges, 1 carton of 6 × .30 Carbine Grenade Blank M6 cartridges, and 1 packet of 5 × M7 Grenade Auxiliary Cartridges).
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
IUPAC states that, "As one of its major activities, IUPAC develops Recommendations to establish unambiguous, uniform, and consistent nomenclature and terminology for specific scientific fields, usually presented as: glossaries of terms for specific chemical disciplines; definitions of terms relating to a group of properties; nomenclature of chemical compounds and their classes; terminology ...
Because the S 2− anion has a subscript of 2 in the formula (giving a 4− charge), the compound must be balanced with a 4+ charge on the Pb cation (lead can form cations with a 4+ or a 2+ charge). Thus, the compound is made of one Pb 4+ cation to every two S 2− anions, the compound is balanced, and its name is written as lead(IV) sulfide .
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decacarbonyl-1κ 3 C,2κ 3 C,3κ 4 C-di-μ-hydrido-1:2κ 2 H;1:2κ 2 H-triangulo-(3 Os—Os), (Decacarbonyldihydridotriosmium). decacarbonyl-1κ 3 C,2κ 3 C,3κ 4 C shows that there are three carbonyl groups on two osmium atoms and four on the third. di-μ-hydrido-1:2κ 2 H;1:2κ 2 H specifies that the two hydride bridge between the osmium atom ...