A chemical equation shows how a reaction proceeds. You can't have “an equation” for simply a compound. If you are talking about how water is produced then there are a few zillion ways. read more
Water is a compound. It is involved in millions of different reactions, some times it is a reactant and sometimes it is a product. Each of which has a chemical equation. Water itself is just [math]H_2O[/math]. No equation needed. read more
A chemical equation is a written representation of the process that occurs in a chemical reaction. A chemical equation is written with the reactants on the left side of an arrow and the products of the chemical reaction on the right side of the equation. read more