Types of Chemical Reactions
H
H
H
H
January 22, 2015
H
O
H
O
H
O
O
H
2H2 + O2 2H2O
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Types of Chemical Reactions
January 22, 2015
Types of Chemical Reaction
1. Synthesis Reaction ­ 2 or more substances combine to form a new
substance.
AB
B
A
+
Example: Na + Cl NaCl
2. Decomposition Reaction ­ Compounds Break Down to form one or more simpler substances.
AB
B
A
+
Example: 2H2O2 AutoSave
O2 + 2H2O
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Types of Chemical Reactions
January 22, 2015
3. Single Replacement Reaction ­ One element replaces another in a compound.
C
AB
AC
+
B
+
Example: BeF2 + Mg
MgF2 + Be
4. Double Replacement Reaction ­ 2 compounds react to form 2 new compounds.
CD
AB
+
BD
AC
+
Example: AgNO3 + NaCl AgCl + NaNO3
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Types of Chemical Reactions
January 22, 2015
Reactions That Involve Heat Energy
1. Exothermic reaction ­ a chemical reaction that releases energy in the form of heat.
Example: When a car engine combines oxygen with gasoline. The engine gets very hot. Combustion releases energy in the form of heat.
2. Endothermic Reaction ­ a chemical reaction that absorbs energy in the form of heat.
Example: Mixing Vinegar & Baking Soda
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