Lewis acids and bases studied chemical bonding. In 1923, Lewis wrote "An acid substance is one which can employ an electron lone pair from another molecule in completing the stable group of one of its own atoms." The Brønsted–Lowry acid–base theory was published in the same year. The two theories are distinct but complementary. A Lewis base is also a Brønsted–Lowry base, but a Lewis acid doesn't need to be a Brønsted–Lowry acid. The classification into hard and soft acids and bases (HSAB theory) followed in 1963. The strength of Lewis acid-base interactions, as measured by the standard enthalpy of formation of an adduct
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