Chemical substance In organic chemistry, there can be more than one chemical compound with the same composition and molecular weight. Generally, these are called isomers. Isomers usually have substantially different chemical properties, and often may be isolated without spontaneously interconverting. A common example is glucose vs. fructose. The former is an aldehyde, the latter is a ketone. Their interconversion requires either enzymatic or acid-base catalysis. However, tautomers are an exception: the isomerization occurs spontaneously in ordinary conditions, such that a pure substance cannot be isolated into its tautomers, even if these can be identified spectroscopically or even isolated in special conditions. A
No Substance Tour and Unwritten Law, although that line-up varied from show to show. Greg Graffin – Vocals<br> Brian Baker – Guitar and back-up vocals<br> Jay Bentley – Bass and back-up vocals<br> Greg Hetson – Guitar<br> Bobby Schayer – Drums No Substance Tour The No Substance Tour was a concert tour by punk rock band Bad Religion in support of their album, "No Substance" The second North American leg was a part of the Warped Tour 1998. Some of the other bands that performed that year were Rancid, NOFX, The Specials, Less Than Jake and Deftones. The second European leg was a part