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.
From Wikipedia, the free encyclopedia. In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases.