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Practice BALANCING CHEMICAL EQUATIONS

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Practice BALANCING CHEMICAL EQUATIONS Powered By Docstoc
					          PRACTICE BALANCING CHEMICAL EQUATIONS

***Conservation of Matter: Matter is never created or destroyed.

A Balanced Chemical Equation has the same number of atoms of each
element on both sides of the equation.

                 Atoms in an UNBALANCED Equation

      Kind of Atom                   Number of Atoms
                                 Ag + H2S  Ag2S + H2
           Ag

           H

            S



Add COEFFICIENTS to the left hand side of a compound so that there are
equal numbers of atoms of each element on both sides of the equation. The
decision for choosing coefficients is often a trial and error process.

***To balance chemical equations you CANNOT change anything in the written
formulas. You can ONLY add coefficients.

                     Atoms in a BALANCED Equation

      Kind of Atom                   Number of Atoms
                                 Ag + H2S  Ag2S + H2
           Ag

           H

            S
     Balance the following equation:
     Potassium Nitrate + Magnesium Chloride  Potassium Chloride + Magnesium Nitrate.

     Note: Nitrate is a polyatomic ion. See the back of your periodic table for the correct chemical formula.


     1. Write a chemical formula for each of the compounds above and then write
        them out in a chemical equation.




     2. What type of chemical reaction is this?




     3. Check to see if the equation is balanced.

     4. Determine coefficients if needed.



                        Balance the Equation
     Write out the equation using the correct chemical formulas.
Kind of
Atom
K
N
O
Mg
Cl

				
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