Types of Chemical
Reactions
5 Types of Chemical Reactions
1)
2)
3)
4)
5)
Synthesis Reaction
Decomposition Reaction
Single Displacement Reaction
Double Displacement Reaction
Combustion Reaction
Synthesis Reaction
Generally:
Element + Element/Compound  Compound
Example:
4Fe(s) + 3O2(g)  2Fe2O3(s)
Synthesis Reaction (cont.)
A synthesis reaction will look like this:
The formula that represents a synthesis
reactions is:
A
+
B 
AB
Synthesis Reaction (cont.)

1)
2)
3)
4)
5)
Identify which of the following reactions
are synthesis reactions:
2Na + Cl2  2NaCl
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HCl + NaOH  NaCl + H2O
2Mg + O2  2MgO
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4Cu + O2  2Cu2O
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6CO2 + 6H2O  C6H12O6 + 6O2
Decomposition Reaction
Generally:
Compound  less complex compound + compound
A decomposition reaction will look like this:
Decomposition Reaction (cont.)
The formula that represents a decomposition
reaction:
AB 
A
+
B
Identify which of the following reactions are
decomposition reactions:
1) 2Na + Cl2  2NaCl
2) HCl + NaOH  NaCl + H2O
3) 2FeCl3  2Fe + 3Cl2
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4) 2CuO  Cu + O2
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Single Displacement Reactions
Generally:
Element + Compound  Compound + Element
Single displacement reactions look like this:
Single Displacement Reactions (cont.)
The formula for a single displacement reaction looks like this:
A
+
BC

AC
+
B
Identify which of the following reactions are single displacement:
1)
2)
3)
4)
5)
2Na + Cl2  2NaCl
AgNO + Cu  CuNO + Ag
2Mg + O2  2MgO
Cu + HNO3  Cu(NO3)2 + H2
Zn + 2HCl  ZnCl2 + H2
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Double Displacement Reaction
Generally:
Compound + Compound  Compound + Compound
Double displacement reactions look like this:
Double Displacement Reaction (cont.)
The formula for a double displacement reaction is:
AB + CD  AD
+ CB
Identify which of the following reactions are double
displacement reactions:
1)
Zn + 2HCl  ZnCl2 + H2
2)
LiNO3 + NaOH  LiOH + NaNO3
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3)
2KCl + MgO  MgCl2 + K2O
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4)
Mg + S  MgS
5)
2H2O2  2H2O + O2
Combustion Reaction

A combustion reaction is when a hydrocarbon
reacts with oxygen. A hydrocarbon is any
compound that is made up of hydrogen and
carbon. Some hydrocarbons also have oxygen
atoms in them.

The products are always carbon dioxide and
water vapour
Combustion Reaction (cont.)
The formula for a combustion reaction is:
Some H, C and/or O compound + O2(g)  H2O(g) + CO2(g)
Combustion Reaction (cont.)
Identify which of the following reactions are
combustion reactions:
1)
2)
3)
4)
5)
CH4 + 2O2  CO2 + 2H2O
HCl + NaOH  NaCl + H2O
C2O2H4 + 2O2  2CO2 + 2H2O
4Cu + O2  2Cu2O
CO2 + 6H2O  C6H12O6 + 6O2
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