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IIIIIIIVV Balancing Equations Ch. 8 – Chemical Reactions

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A. Balancing Steps 1.Write the unbalanced equation. 2. Count atoms on each side of the arrow. 3. Put in coefficients to make #s of atoms for each element equal on both sides of the arrow. Do not change any subscript!!! Coefficient subscript = # of atoms 4.Reduce coefficients to lowest possible ratio, if necessary. 5.Double check atom balance!!!

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B. Helpful Tips n Balance one element at a time. n Update ALL atom counts after adding a coefficient. n If an element appears more than once per side, balance it last. n Balance polyatomic ions as single units. “1 SO 4 ” instead of “1 S” and “4 O”

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1 1 1 1 2 3 Al + CuCl 2 Cu + AlCl 3 Al Cu Cl 2 3 6 3 33 2 C. Balancing Example Aluminum and copper(II) chloride react to form copper and aluminum chloride. 2 2 6

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Balance the following equations: 1.) Fe 2 O 3 + H 2 Fe + H 2 O 6 3 3 3 2 6 Fe O H 2 2 1 3 1 2

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Ag NO 3 H S 2.) AgNO 3 + H 2 S Ag 2 S + HNO 3 2 2 2 2 1 2 1 2 11

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Problems (cont.) 3.) Zn(OH) 2 + H 3 PO 4 Zn 3 (PO 4 ) 2 +H 2 O 4.) SO 2 + O 2 SO 3 5.) MnO 2 + HCl MnCl 2 + H 2 O + Cl 2

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