REMEMBER:
A balanced equation has the same number of atoms of
each element on both sides.
Ex. If you start a reaction with 2 Hydrogen atoms, you need to
end the reaction with 2 Hydrogen atoms.
COEFFICIENTS
If a coefficient is in front of a molecule (Ex. 2 H 2O), then
every subscript in that molecule gets multiplied by
that coefficient.
1. IS THIS EQUATION BALANCED?
H2 + O 2  H2O
Hint:
Count how many Hydrogens you have on the left. Does it
match how many you have on the right?
Now do the same for Oxygens. Are there equal numbers
of atoms on the left and right?
2. IS THIS EQUATION BALANCED?
CH4 + 2 O2  CO2 + 2 H2O
3. IS THIS EQUATION BALANCED?
Fe + O2  Fe2O3
4. IS THIS EQUATION BALANCED?
2 HgO  Hg + O2
5. IS THIS EQUATION BALANCED?
Cu + 2 AgNO3  Cu(NO3)2 + 2 Ag
6. IS THIS EQUATION BALANCED?
NH3 + O2  N2 + H2O
7. IS THIS EQUATION BALANCED?
C3H8 + O2  H2O + CO2
8. IS THIS EQUATION BALANCED?
Zn + HCl  ZnCl2 + H2
9. IS THIS EQUATION BALANCED?
Ba3N2 + 6 H2O  3 Ba(OH)2 + 2 NH3
10. IS THIS EQUATION BALANCED?
SnO2 + 2 H2  Sn + 2 H2O