Name: Answer Key Period: ______ Date: __________ Chem A odds for HW and evens for extra practice
WS 1.7: Harder Balancing Problems
Directions: Balance the following chemical equations. Descriptions of the equation, physical states, and atoms that are ions (have a
positive or negative charge) have absolutely no effect on balancing. The problems at the very end with a “**” are extremely difficult.
They are far more difficult thaN the problems that will appear on your test of final exam. Give them a try if you like a challenge or have
extra time in class
1) 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g)
2) 2 NaN3(s) 2 Na(s) + 3 N2(g)
3) 6 Na + Fe2O3 3 Na2O + 2 Fe
4) 3 Mg(s) + N2(g) Mg3N2(s)
5) 2 Na + 2 NH3 2 NaNH2 + H2
6) Na2O + 2 CO2 + H2O 2 NaHCO3
7) P4S3(s) + 6 O2(g) P4O6(g) + 3 SO2(g)
8) 2 Na3PO4 + 3 CaCl2 Ca3(PO4)2 + 6 NaCl
9) 2 C8H18(l) + 25 O2(g) 16 CO2(g) + 18 H2O(g)
10) C2H6O(l) + 3 O2(g) 2 CO2(g) + 3 H2O(g)
11) Pb(NO3)2 + 2 KI PbI2 + 2 KNO3
12) 2 N2O5 4 NO2 + O2
13) 2 KClO3(s) 2 KCl(s) + 3 O2(g)
14) 2 CO(g) + O2(g) 2 CO2(g)
15) 2 C57H110O6(s) + 163 O2(g) 114 CO2(g) + 110 H2O(l)
16) 6 Na + 2 O2 2 Na2O + Na2O2
