Chemical substance identity of benzene, until the correct structure was described by Friedrich August Kekulé. Likewise, the idea of stereoisomerism – that atoms have rigid three-dimensional structure and can thus form isomers that differ only in their three-dimensional arrangement – was another crucial step in understanding the concept of distinct chemical substances. For example, tartaric acid has three distinct isomers, a pair of diastereomers with one diastereomer forming two enantiomers. An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it
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