YMCA Prices. The YMCA (Young Menâs Christian Association) is an organization which aims to put Christian values and principles in place by helping members develop a sound mind, body and spirit. The organization, which began in 1944, now has 125 national associations with members and beneficiaries numbering in the millions.
A chemical reaction is a process in which the identity of at least one substance changes. A chemical equation represents the total chemical change that occurs in a chemical reaction using symbols and chemical formulas for the substances involved.
In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs. A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation).