Balancing Equations.

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Presentation transcript:

Balancing Equations

Law of Conservation of Mass Matter cannot be created or destroyed. Equations must be balanced Have equal numbers of each type of atom on each side.

__Na + __H2O  __NaOH + __H2 Is it balanced? __Na + __H2O  __NaOH + __H2 Place coefficients in the blanks to balance. Mostly just trial and error. Never change subscripts, b/c it changes the substance. If polyatomic ions exist on both sides of the equation keep together as a group. Coefficients have to be at the smallest ratio. So reduce if necessary

___H2 + ___O2  ___H2O

___Fe2O3 + ___ H2  ___ Fe + ___ H2O

__Al +__HAsO3  __H2 +__Al(AsO3)3

___C6H14 + ___O2 → ___CO2 + ___H2O Sometimes you end up with and odd # on one side and an even # on the other– multiply all coefficients by 2 then balance