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General reaction scheme for the S N 1 reaction. The leaving group is denoted "X", and the nucleophile is denoted "Nu–H". The unimolecular nucleophilic substitution (S N 1) reaction is a substitution reaction in organic chemistry.
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You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...
The StockXpert website in 2009. Until 2009, stock.xchng operated alongside its sister site, Stockxpert.Stockxpert was designed with a near-identical user interface, but functioned as a commercial microstock photography site, allowing users, through a system of online credits, to purchase and download images for a very low cost, often as low as US$1.
Correct misinterpretations of free images. One of the main complaints about free images is lack of quality when compared with a promotional images. That is not true: there are very good free images as shown by Wikipedia:Featured pictures. In the case of replaceable images, it is possible that a promotional image will look better than free versions.
Wikipedia:Picture of the day is an image which is automatically updated each day with an image from the list of featured pictures. The {{ POTD }} template produces the image shown above. Category:Wikipedia Picture of the day lists the different templates that can be used.
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