The first set of class notes for this unit were over double replacement reactions.
A double replacement reaction is when two compounds react together to form two new compounds. In these reactions, the positive ions replace each other.
The general formula for double replacement reactions is: AB + CD → AD + CB
Double replacement reactions have four different driving forces:
- Formation of gas
- Formation of water
- Formation of a solid
- Transfer of electrons
The formation of gas in a reaction can be seen in double replacement, decomposition, and combustion reactions. Formation of water is shown in both acid-base neutralization reactions, and combustion reactions. When a solid forms in a reaction, this is referred to as a double replacement precipitation reaction. Lastly, the transfer of electrons is shown during redox, synthesis, decomposition, and single replacement reactions.
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