S: (n) catalysis (catalysis%1:22:00::), contact action (contact_action%1:22:00::) (acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction) "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
S: (n) cracking (cracking%1:22:00::) (the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process))
S: (n) inversion (inversion%1:22:00::) (a chemical process in which the direction of optical rotation of a substance is reversed from dextrorotatory to levorotary or vice versa)
S: (n) sequestration (sequestration%1:22:00::) (the action of forming a chelate or other stable compound with an ion or atom or molecule so that it is no longer available for reactions)