1. Types of Chemical Reactions Notes

2. Synthesis Reaction
2 elements or compounds combine to make one compound.
A + B ® AB
Na + Cl2 ® NaCl
Ca +O2 ® CaO

3. Decomposition Reactions
decompose = fall apart
one compound (reactant) falls apart into two or more elements or compounds.
AB  A + B
NaCl  Na + Cl2

4. Single Replacement or Displacement
One element replaces another
Reactants must be an element and a compound.
Products will be a different element and a different compound.
A + BC ® AC + B
Na + SrCl2 ® Sr + NaCl

5. Double Replacement Two compounds replace each other. AB + CD  AD + CB
ZnS + HCl  ZnCl + H2S

6. Combustion CH4 + O2  CO2 + H2O
A hydrocarbon reacts with oxygen to produce carbon dioxide and water
CH4 + O2  CO2 + H2O

7. We do (name the type of reaction)
HgO  Hg + O2
Cl2 + NaBr  NaCl + Br2
C3H O2  CO H2O 
CuCl2 + H2S  CuS + HCl
P + O2  P4O10