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IIIIIIIVV II. Balancing Equations (p ) Ch. 9 – Chemical Reactions

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A. Balancing Steps 1.Write the unbalanced equation. 2.Count atoms on each side. 3.Add coefficients to make #s equal. 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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Why is there a 2 after the oxygen? __________________ What are all the diatomic elements? _________________ Oxygen is diatomic Br, I, N, Cl, H, O, F

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Reactants Products Yields SubscriptCoefficient

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Counting Atoms 1) H 3 PO 4 2) 3NaOH 3) 2K 2 C 2 H 3 O 2 4) Mg 3 (PO 4 ) 2

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More Counting Atoms 1) 3Al(NO 3 ) 3 2) 3Al 2 (SO 4 ) 3 3) 2Ca(OH) 2 4) 3NH 4 NO 3

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Balanced or not? n H 2 + O 2 H 2 O n CH 4 + O 2 CO 2 + H 2 O n Mg + O 2 MgO

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How to Balance n All the atoms on the reactants side must equal all the atoms on the products side n First, you need to count all the atoms H 2 + O 2 H 2 O H O

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How to Balance n Are they equal? n Add coefficients to change the number of atoms H 2 + O 2 H 2 O H O Balanced!! Good job Balanced!! Good job

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C. Balancing Example Aluminum and copper(II) chloride react to form copper and aluminum chloride.

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Practice… Sn +HF SnF 2 + H 2 Cu+ AgNO 3 Cu(NO 3 ) 2 +Ag

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Now You Try! WO 3 +H 2 W +H 2 O Fe+O 2 Fe 2 O 3 SiO 2 +C SiC+CO

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