L18-Chemical_Reactions_and_Stoichiometry

L18-Chemical_Reactions_and_Stoichiometry - Part III...

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Part III Chemical Reactions and Stoichiometry: Aqueous Solutions Chemical Equations Law of conservation of Mass matter is not created or destroyed during a chemical reaction We balance chemical equations to obey the Law of Conservation of Mass All the atoms we start with, we have to end up with Balancing chemical equations Balancing Equations the same number of each kind of atom has to be on both sides of the equation atoms of reactants end up in the products pay attention to both subscripts and coefficients the whole number in front of the formula Balancing Equations O 2 2 atoms of oxygen 3O 2 6 atoms of oxygen CO 2 1 atom of carbon, 2 atoms of oxygen 3CO 2 3 atoms of carbon, 6 atoms of oxygen 2Ca(NO 3 ) 2 2 atoms of calcium, 4 atoms of nitrogen, 12 atoms of oxygen 1 2 3 4
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Balancing Equations 1. Write the skeleton equation (reactants products) 2. Balance the atoms using coefficients • start with the most complex substance • write formulas for substances as they exist • end with the least complex substance 3. Do an atom check ***Don’t change the formulas*** Balancing Equations Example 3: Combustion of Octane (C8H18) in gasoline
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