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
2011 Super League season results at Millennium Stadium, as part of Magic Weekend<br> B. All St Helens home games in 2011 to be played at Halton Stadium<br> C. Game to be rescheduled for later date, due to Wigan's involvement in the 2011 World Club Challenge 2011 Super League season results This is a list of the 2011 Super League season results. Super League is the top-flight rugby league competition in the United Kingdom and France. The 2011 season started on 12 February, with the Magic Weekend at the Millennium Stadium in Cardiff, and ended on 8 October with the 2011 Super League Grand Final. The