Clues a chemical reaction has occurred are color change, formation of a solid, bubbles, and heat is produced or absorbed. The anatomy of a chemical equation is:
Subscripts tell us number of atoms of each element in a molecule. Coefficients tell us the number of molecules. In a combustion reaction, reaction with oxygen that produces a flame, the product is always CO2 + H2O. To balance these equations you must follow the CHO method. Balance in order starting with Carbon then Hydrogen then Oxygen. The following link can help describe the CHO method a bit more
http://www.onlinemathlearning.com/balance-chemical-equation.html
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