Balancing Chemical Equations

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Presentation transcript:

Balancing Chemical Equations What information could a correctly balanced chemical equation provide?

Chemical reactions obey the laws of conservation of mass, charge, and energy The total mass of the reactants is the same as the total mass of the products. The total charge of the reactants is the same as the total charge of the products.

An equation is correctly balanced if: there are the same number of atoms of each element involved on both sides

Electrolysis of Water Water  Hydrogen + Oxygen 2 2 H2O  H2 + O2

Balancing by Inspection Count the number of atoms on both sides Find an element that is out of balance and fix it Add/Change Coefficients until each element is balanced NEVER change Subscripts 2 2 Na + Cl2  NaCl

The coefficients of a correctly balanced chemical equation can tell you: The number of atoms / molecules that react The moles worth of atoms / molecules that react The relative volumes of gases that react (if reactants and products are gases)