First Order
If a reaction rate depends on a single reactant and the value of the exponent is one, then the reaction is said to be first order. In organic chemistry, the class of SN1 (nucleophilic substitution unimolecular) reactions consists of first-order reactions. For example, in the reaction of aryldiazonium ions with nucleophiles in aqueous solution ArN2+ + X− → ArX + N2, the rate equation is r = k, where Ar indicates an aryl group.
Another class of first-order reactions is radioactive decay processes which are all first order. These are, however, nuclear reactions rather than chemical reactions.
Read more about this topic: Order (chemistry)
Famous quotes containing the word order:
“Ever since surgery began, mans destiny has been to suffer, in order that he might be cured. And no one can change that, gentlemen.”
—Jean Scott Rogers. Robert Day. Mr. Blount (Frank Pettingell)
“Children need people in order to become human.... It is primarily through observing, playing, and working with others older and younger than himself that a child discovers both what he can do and who he can becomethat he develops both his ability and his identity.... Hence to relegate children to a world of their own is to deprive them of their humanity, and ourselves as well.”
—Urie Bronfenbrenner (b. 1917)