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Types: Single displacement Example: Zn + CuCl 2 Zn Cl Cu + General: AB + C AC + B Cl Zn Cu + Metal replaces a metal
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Chemical Reactions
1. A chemical change is any change in which a new substance is formed.
Evidence: Release of energy as heat and light, change in color, formation of gas, change in odor, etc.
Common Types of Chemical Reactions
single displacement: A + BC AC + B
double displacement: AB + CD AD + CB
synthesis (formation): A + B AB
decomposition: AB A + B
combustion: CxHy + O2 CO2 + H2O
Types: Single displacement
Example: Zn + CuCl2
ZnClCl Cu +
General: AB + C AC + B
ClCl Zn Cu+
Metal replaces a metal
Types: Single displacement
Example: KBr + Cl2
ClK Br +
General: AB + C AC + B
+ Cl K Cl Br
Br
Nonmetal replaces a nonmetal
Types: Double displacement
Example: MgO + CaS
General: AB + CD AD + CB
SOMg Ca+
O S
Mg Ca+
Types: Double displacement
Sub categories:
General: AB + CD AD + CB
Precipitation Reactions AB(aq) + CD(aq) AD(aq) + CB(s)
Acid / Base Reactions HB + COH H2O + CB
Types: Synthesis (Combination)
Example C + O2
OO C + O O C
General: A + B AB
Types: Decomposition
Example: NaCl
General: AB A + B
Cl Na Cl + Na
Types: Decomposition
Example 2HgO
O Hg
O Hg
Hg
O O Hg
+
General: AB A + B
Types: Combustion
CxHy + O2 CO2 + H2OA hydrocarbon(could also have oxygen)burning “completely”
Completely meaning it forms carbon dioxide andwater
Decomposition
Double Displacement
Single Displacement
Combustion
CO2 + H2OO2
Combustion
CO2 + H2OO2
Common Types of Chemical Reactions
single displacement: A + BC AC + B
double displacement: AB + CD AD + CB (examples: precipitation and acid/base)
synthesis (combination): A + B AB
decomposition: AB A + B
combustion: CxHy + O2 CO2 + H2O
