1. Balancing Equations…30

2. Balancing Equations Notes…29
Equations must be balanced because matter can’t be created or destroyed- Law of Conservation of Mass
Must have equal numbers of atoms of each element on both sides
When balancing equations you may only add a coefficient.
You may NOT change a subscript! (this will change the compound)

3. 3H20
Subscript
Coefficient

4. NaNO3 2NaNO3
Na: Na:
N: N:
O: O:

5. MgPO3 6MgPO3
Mg: Mg:
P: P:
O: O:

6. Ex. 1: Na I NaI + Na I Na I I I Na Na

7. Ex. 2: K2O H2O KOH K K K H H O H + O K O H O

8. Ex. 3: Mg + HCl MgCl H2 H Cl Mg + H Cl Mg + H H Cl Cl

9. Ex. 4: S + O2 SO3 O + O S S O O O

10. Ex. 5: CH4 + O2 CO2 + H2O Hint: Fix the hydrogen's first!
Balancing Equations