L14 - Balancing Chemical Equations

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					Balancing Chemical
Equations
  Science 10
Word Equation

    Every chemical reaction can be
     presented as a word equation. The word
     equation will then be used to build a
     skeleton equation and finally a balanced
     chemical equation
        Hydrogen gas reacts with oxygen gas to
         form water
Skeleton Equation

    An unbalanced equation is developed
     from the word equation:
      Hydrogen gas reacts with oxygen gas to
       form water
      __H2 + __O2  __H2O
Balanced Equation

    The balanced equation is produced
     using the lowest possible ratio in front of
     each element or compound to have the
     same number and type of atoms on each
     side
      Hydrogen gas reacts with oxygen gas to
       form water (word)
      __H2 + __O2  __H2O (skeleton)
      2 H2 + 1 O2  2 H2O (balanced)
MINOH
  A standard approach can be helpful in
   balancing chemical equations
  The MINOH method provides the order in
   which elements will be considered when
   balancing an chemical equation
        M – metals
        I – polyatomic ions
        N – non-metals (except oxygen and hydrogen)
        O – oxygen
        H - hydrogen
Balancing

          __H2 + __O2  __H2O
           2              2

M
            O- 2           O -12
I           H- 24          H - 24
N
O
H
Balancing

       __H2SO4 + __NaOH  __H2O +__Na2SO4
                   2        2
M         Na -    1 2        Na -    2
I         SO4 –   1          SO4 –   1
N         O–      1 2        O–      12
          H-      3 4        H-      24
O
H
Balancing

        __C3H8 + __O2  __CO2 +__H2O
                  5       3      4
 M         C- 3                C- 13
 I         O – 2 10            O – 3 7 10
 N         H– 8                H –2 8
 O
 H
Practice Problems


    MINOH Practice Sheet
        Problems 1-20

				
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posted:10/31/2011
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