1. Balancing Equations

2. 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.

3. __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

5. ___H2 + ___O2  ___H2O

6. ___Fe2O3 + ___ H2  ___ Fe + ___ H2O

7. __Al +__HAsO3  __H2 +__Al(AsO3)3

8. ___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