1. Aim: What are the different types of chemical reactions

2. Types of Chemical Reactions
There are 4 main kinds of reactions that occur between elements and compounds.
Each of these chemical reactions follow a specific format from reactants to products. If you recognize the format you will be able identify the type of reaction.

3. SYNTHESIS REACTIONS Also called combination reactions.
General Equation Format
A + B  AB
***These reactions will only have ONE product***
Example: 2H2 + O2  2H2O
This reaction represents the “Synthesis of Water”

4. DECOMPOSITION REACTIONS
Also called analysis reactions.
General Equation Format
AB  A + B
***You can recognize this because it only has ONE reactant***
Example: CH4  C + 2H2
This reaction is known as the “Decomposition of Methane”

5. SINGLE REPLACEMENT
Often yield such gases as H2 when it involves an acid.
AB + C  AC + B
*** Notice these reactions have a compound and an element as a reactant and product***
Example: Mg + 2HCl  MgCl2 + H2

6. DOUBLE REPLACEMENT AB + CD  AD + CB
Two elements in two different compounds switch or replace one another.
Often occurs in aqueous solutions of ionic compounds.
AB + CD  AD + CB
*** These reactions will have two compounds on the reactant and product sides.***
Example: 3NaCl + AlPO4  Na3PO4 + AlCl3

7. Summary- There are 4 Basic Types of Reactions
Synthesis
Decomposition
Single replacement
Double replacement