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