Types of Reactions
1.
2.
3.
4.
5.
Synthesis reactions
Decomposition reactions
Single displacement reactions
Double displacement reactions
Combustion reactions
You need to be able to identify each type.
1. Synthesis
Example C + O2
C + O O
General:

O C O
A + B  AB
Ex. Synthesis Reaction
Practice
• Predict the products.
2 Na(s) + Cl2(g)  2 NaCl(s)
Mg(s) + F2(g) 
2 Al(s) +3 F2(g) 
MgF2(s)
2 AlF3(s)
• Now, balance them.
2. Decomposition
Example: NaCl
Cl Na

General:
Cl
+
Na
AB  A + B
Ex. Decomposition Reaction
3. Single Displacement
Example: Zn + CuCl2
Zn was oxidized
Went from neutral (0) to (+2)
Cu
Cl
+
Cl
Zn

Zn
Cl
+
Cu
Cl
Cu was reduced
Went from (+2) to Neutral (0)
General:
AB + C  AC + B
Ex. Single Replacement Reaction
Single Replacement Reactions
• Write and balance the following single
replacement reaction equation:
• Zn(s) + 2 HCl(aq)  ZnCl2 + H2(g)
• 2 NaCl(s) + F2(g) 2 NaF(s) + Cl2(g)
•2 Al(s)+ 3 Cu(NO3)2(aq) 3 Cu(s)+ 2 Al(NO3)3(aq)
4. Double displacement
Example: MgO + CaS
Mg
+
O
General:
Ca
S

Mg
S
+
Ca
O
AB + CD  AD + CB
Double Replacement Reactions
• Think about it like “foil”ing in algebra, first and
last ions go together + inside ions go together
• Example:
AgNO3(aq) + NaCl(s)  AgCl(s) + NaNO3(aq)
• Another example:
K2SO4(aq) + Ba(NO3)2(aq) 2 KNO3(aq) + BaSO4(s)
Practice
•
Predict the products.
1.
2.
3.
4.
5.
HCl(aq) + AgNO3(aq) 
CaCl2(aq) + Na3PO4(aq) 
Pb(NO3)2(aq) + BaCl2(aq) 
FeCl3(aq) + NaOH(aq) 
H2SO4(aq) + NaOH(aq) 
6. KOH(aq) + CuSO4(aq) 
5. Combustion Reactions
• Combustion reactions - a
hydrocarbon reacts with
oxygen gas.
• This is also called
burning!!!
• In order to burn something
you need the 3 things in
the “fire triangle”:
• 1) Fuel (hydrocarbon)
2) Oxygen
3) Something to ignite the
reaction (spark)
Combustion Reactions
• In general:
CxHy + O2  CO2 + H2O
• Products are ALWAYS
carbon dioxide and water.
(although incomplete burning
does cause some by-products
like carbon monoxide)
• Combustion is used to heat
homes and run automobiles
(octane, as in gasoline, is
C8H18)
Combustion
• Example
•
C5H12 + 8 O2  5 CO2 + 6 H2O
• Write the products and balance the
following combustion reaction:
•
C10H22 + O2 
Mixed Practice
•
State the type & predict the products.
1.
2.
3.
4.
5.
BaCl2 + H2SO4 
C6H12 + O2 
Zn + CuSO4 
Cs + Br2 
FeCO3 