Worksheet: Balancing Equations
I.
Name __________________
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical
reaction. ________________ are the starting substances in the reaction
while ________________ are the new substances that are formed. The
large
numbers
in
front
of
some
of
the
formulas
are
called
________________. These numbers are used to ________________ the
equation
because
chemical
reactions
must
obey
the
Law
of
________________ of Matter. The number of atoms of each element on
both sides of the equation must be ________________ because matter
cannot be ________________ or ________________.
When balancing
equations, the only numbers that can be changed are ________________;
remember that ________________ must never be changed in order to
balance an equation.
II.
Balance the following equations:
1.
Al +
O2 
2.
C3H8
3.
Al(NO3)3
+
Al2O3
O2 
+
CO2 +
NaOH 
H2O
Al(OH)3
+
CHEMISTRY: A Study of Matter
© 2004, GPB
6.23
NaNO3
4.
KNO3 
KNO2
5.
O2
6.
KClO3 
KCl
7.
BaF2
K3PO4
8.
H2SO4
9.
Al +
10.
WO3 +
+
CS2
+
+
+
O2
CO2

+
+
O2
Ba3(PO4)2

Mg(NO3)2 
H2SO4 
H2 
SO2
KF
MgSO4 +
Al2(SO4)3 +
W
+
+
H2
H2O
CHEMISTRY: A Study of Matter
© 2004, GPB
6.24
HNO3