What is the Law of Conservation of Mass? Focus 5 Nov 27, 28 What is the Law of Conservation of Mass? What steps are followed when balancing a chemical equation?

Matter CANNOT be created or destroyed. It can only change form. H2O is NOT the same as H2o2.

1. Remember the Law of Conservation of Mass You must have the same number of atoms of each element on both sides of the equation

2. You may NEVER change a subscript. Why? Because you completely change the identity of the molecule!

3. Tally the beginning number of atoms of each element on both sides of the equation.

Using a pencil, begin to insert coefficients in front of molecules Using a pencil, begin to insert coefficients in front of molecules. When you do, change the number of atoms in your tally. Be prepared to erase!

Sometimes you may have to begin with guessing.

H + O H2O