Types of Chemical Reactions
And
Balancing Equations II W.S.
Name ________________________
Period _____
Score _____
1. A decomposition reaction starts with one reactant and ends up with two or more
products. Circle all of the equations which are decomposition reactions.
a.
b.
c.
d.
e.
NaCl ---------------> Na + Cl2
Na + Cl2 ---------> NaCl
H2O -------------> H2 + O2
H2 + O2 ---------> H2O
NaOH + HCl ------------> HOH + NaCl
2. A synthesis reaction starts with two reactants and ends up with one product. Circle all
of the equations which are sysnthesis reactions.
a.
b.
c.
d.
e.
NaCl --------------> Na + Cl2
Na + HCl ----------> H2 + NaCl
H2 + O2 ------------> H2O
NaOH + HCl -----------> HOH + NaCl
K + Cl2 ------------> KCl
3. A single replacement reaction starts with two reactants and ends up with two
products. The uncombined element takes the place of the combined element in the
compound. Circle all of the equations which are single replacement reactions.
a.
b.
c.
d.
e.
NaCl -----------------> Na + Cl2
NaOH + HCl ----------> HOH + NaCl
K + AgCl --------------> Ag + KCl
Ca + S ---------------> CaS
Na + HCl -------------> H2 + NaCl
4. A double replacement reaction starts with two reactants and ends up with two
products. In this case both reactants are compounds and both products are
compounds. They simply change “partners”. Circle all of the equations which are
double replacement reactions.
a. NaCl -------------> Na + Cl2
d. KOH + HNO3--->HOH + KNO3
b. NaOH + HCl ---------------> HOH + NaCl e. Ca + S ---------> CaS
c. Na + HCl -------------------> H2 + NaCl
More problems on back of page!
Balance the following equations by inserting the LOWEST possible coefficients.
1.
HgO ------------------------------>
2.
Mg
3.
H2
4.
KClO3
5.
Cl2
6.
H2O
7.
P4
+
O2
8.
Zn
+
HCl
9.
B
10.
Na2SO4
--------------------->
11.
Fe
+
Cl2
12.
Al
+
HCl
--------------------->
13.
Br2
CuI
-------------------->
14.
C
+
H2
--------------------->
15.
S
+
Al
------------------->
+
+
HCl --------------->
O2 -------------->
------------------>
+
NaBr
+
+
Fe
+
MgCl2
O2
+
H2
H2O
KCl
+
O2
------------------->
NaCl
+
Br2
-------------------->
Fe2O3
+
H2
--------------------->
P4O10
--------------------->
O2
+
Hg
--------------------->
ZnCl2
+
H2
AlCl3
+
H2
CuBr
+
I2
B2O3
Na2S
--------------------->
+
O2
FeCl3
CH4
Al2S3