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
2012 Super League season results at Etihad Stadium as part of Magic Weekend<br> F. Galpharm Stadium renamed John Smith's Stadium as of 1 August 2012 <br> G. Game switched to Leigh Sports Village due to fixture clash with co-tenants Sale Sharks 2012 Super League season results This is a list of the 2012 Super League season results. Super League is the top-flight rugby league competition in the United Kingdom and France. The 2012 season started on 4 February and ends on 6 October with the 2012 Super League Grand Final at Old Trafford. The Magic Weekend was scheduled over the weekend of 26 and 27