Lesson 3: Classifying Chemical Reactions
Assume that Q, T, X, and Z are symbols for elements. Match each equation in Column A with the
reaction type it represents in Column B.
Column A
Column B
________ 1.
Q + XZ → X + QZ
________ 2.
Q + Z → QZ
________ 3.
QT → Q + T
________ 4.
QT + XZ → QZ + XT
a.
decomposition
b.
double-replacement
c.
single-replacement
d.
synthesis
Answer the following questions.
5.
Does the following equation represent a combustion reaction, a synthesis reaction, or
both? Explain your answer.
2C(s) + O2(g) → 2CO2(g) + energy
6.
Why is it sometimes incorrect to state that a compound is broken down into its component
elements in a decomposition reaction?
7. Determine what type of reaction each of the equations below and then balance the
equations.
a)
PbCl2 +
b)
NH3
c)
AlCl3 + Na2SO4 →
d)
Zn + S8 → ZnS
e)
Al2(SO4)3 + BaCl2 →
f)
Al2S3
+
AgNO3 → Pb(NO3)2
HCl
→
Al
+
AgCl
→ NH4Cl
+
Al2(SO4)3 + NaCl
BaSO4 + AlCl3
S8
g)
H2SO4
+
h)
CaCO3
i)
C12H22O11
j)
Mg(OH)2
Fe
+
→
H3PO4
+
O2
+
H2
→
→
H2SO4
→
+
FeSO4
H 2O
CO2
+
+
MgSO4
CO2
+
Ca3(PO4)2
H 2O
+
H 2O
8. Determine what type of reaction each of the equations in order to predict products and
write a balanced equation
a)
NaOH
+
CuSO4
b)
C4H12
c)
Na
+
F2
d)
AgF
+
CaCl2
e)
Na
f)
MgO
g)
Li2SO4 + MgCl2 →
h)
HCl
i)
N2 + H2 →
j)
C2H4 + O2 →
+
+
O2
→
→
→
CaF2
→
→
→
+ Zn →