Name ___________________________________________ Date ____________ Period _____
Balancing Chemical Equations
The Law of Conservation of Matter states that all matter was created at the moment of the
___________ ___________. Matter cannot be ___________________ or
___________________ but can change _____________. For example, 2 Hydrogen atoms can
__________ to form Helium. We ________________ chemical equations to reflect this.
Instructions:
Work with your partner to balance the following chemical equations. Use a pencil.
Easy ones
1)
2)
3)
4)
5)
___ H2 + ___ O2 ___ H2O
___ Mg + ___ O2 ___ MgO
___ Li + ___ F2 ___ LiF
___ K + ___ O2 ___ K2O
___ H2O2 ___ H2O + ___ O2
A little harder ones
6) ___ Al + ___ Cl2 ___ AlCl3
7) ___ Ag2O ___ Ag + ___ O2
8) ___ H2 + ___ N2 ___ NH3
9) ___ Ca + ___ H2O ___ Ca(OH)2 + ___ H2
10) ___ SeCl6 + ___ O2 ___ SeO2 + ___ Cl2
Hard ones
11) ___ Al + ___ Fe2O3 ___ Fe + ___ Al2O3
12) ___ KNO3 + ___ H2CO3 ___ K2CO3 + ___ HNO3
13) ___ SiCl4 + ___ H2O ___ SiO2 + ___ HCl
14) ___ H3PO4 + ___ HCl ___ PCl5 + ___ H2O
15) ___ Pb(NO3)2 + ___ NaI ___ PbI2 + ___ NaNO3