Everett Community College does not discriminate on the basis of race, religion, creed, color, national origin, age, sex, marital status, disability, or veteran status. BALANCING CHEMICAL EQUATIONS The Law of Conservation of Mass says that in a chemical reaction, matter is neither created nor destroyed. Practically speaking, whatever atoms begin in the reactants of a chemical reaction, the same number of atoms of each element must appear in the products. The process of balancing chemical equations is intended to reflect reality, that is, to give us a true picture of how many of each atom or molecule are consumed or produced in a chemical reaction. Principle: only coefficients can be altered. Chemical formulas are fixed: no subscripts can change. unbalanced: ____ Al + ____ HCl ____ AlCl 3 + ____ H 2 Step1: Put a " 1 " in front of the formula with the largest number of atoms. Step 1: ____ Al + ____ HCl __ 1 _ AlCl 3 + ____ H 2 Step 2: Balance the elements that appear in compounds. Step 2:
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This note was uploaded on 10/04/2010 for the course CHEM 145 taught by Professor Prezhdo during the Fall '08 term at University of Washington.