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.
Combustion Reaction Defined. Chemical reactions are very common. A chemical reaction is any process by which the atoms of one or more substances are rearranged to form different substances.There are numerous types of chemical reactions.ombustion reactions are very common because oxygen readily reacts with many substances. One combustion reaction that has been very important throughout history is the burning of coal.