1. Types of Reactions: The Basics
Synthesis reactions
Decomposition reactions
Single displacement reactions
Double displacement reactions
Combustion reactions
You need to be able to identify each type.

2. 1. Synthesis General: A + B  AB  Example C + O2 CO2  + O O
*** Remember, even though the “Magic 7” have a subscript (ex/ O2),
they are still considered just a single element***

3. Synthesis (combination)
General: A + B  AB
A synthesis reaction will always have:
2 or more reactants
1 product

4. Ex. Synthesis Reaction

5. 2. Decomposition General: AB  A + B Example: NaCl Na + Cl   + Na Cl

6. Decomposition
General: AB  A + B
A decomposition reaction will always have:
1 reactant
2 or more products

7. Ex. Decomposition Reaction

8. 3. Single Replacement (or single displacement)
General: AB + C  AC + B
Example: CuCl Zn  ZnCl2 + Cu  Zn Cl Cu + Cl Zn Cu +

9. Single Replacement
General: AB + C  AC + B
A single replacement reaction will always have:
1 compound and 1 element as reactants
1 compound and 1 element as products

10. Ex. Single Replacement Reaction

11. 4. Double replacement (double displacement)
General: AB + CD  AD + CB
Example: MgO + CaS  MgS + CaO S O  Mg Ca + O S Mg Ca +

12. Double Replacement
General: AB + CD  AD + CB
A double replacement reaction will always have:
2 compounds as reactants
2 compounds as products

13. 5. Combustion Reactions C#H# Examples: CH4 C2H6
Combustion reactions - a hydrocarbon reacts with oxygen gas.
This is also called burning!!!
Hydrocarbons are compounds that contain only carbon and hydrogen
C#H#
Examples: CH4
C2H6

14. Combustion Reactions In general: C#H# + O2  CO2 + H2O
Reactants are ALWAYS
C#H# and O2 gas.
Products are ALWAYS CO2 and H2O.

15. Combustion Example **note: the equation above is not balanced**
C5H O2  CO2 + H2O
**note: the equation above is not balanced**

16. Mixed Practice State the reaction type BaCl2 + H2SO4  BaSO4 + HCl
(equations are not balanced)
BaCl2 + H2SO4  BaSO4 + HCl
C6H12 + O2  CO2 + H2O
Zn + CuSO4  Cu + ZnSO4
Cs + Br2  CsBr2
FeCO3  Fe + CO2