Lewis acids and bases ionic bonding. Classically, the term "Lewis acid" is restricted to trigonal planar species with an empty p orbital, such as BR where R can be an organic substituent or a halide. For the purposes of discussion, even complex compounds such as EtAlCl and AlCl are treated as trigonal planar Lewis acids. Metal ions such as Na, Mg, and Ce, which are invariably complexed with additional ligands, are often sources of coordinatively unsaturated derivatives that form Lewis adducts upon reaction with a Lewis base[citation needed]. Other reactions might simply be referred to as "acid-catalyzed" reactions. Some compounds, such as HO, are
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