5 Types of Reactions
1. Synthesis Reactions combine 2 or more elements to form a compound. (More complex synthesis reactions combine 2 or more compounds to form a more complex compound.)
2. Decomposition Reactions decompose a compound into 1) its component elements or 2) into simpler compounds or 3) into an element and a simpler compound.
3. A Single Displacement Reaction is a reaction between an element and a compound. The element displaces one of the elements in the compound.
4. A Double Displacement Reaction is a reaction between two compounds. One of the elements in one compound displaces one of the elements in the other compound. Precipitation reactions and acid/base neutralization reactions are both double displacement reactions.
5. Combustion Reactions are always reactions between some fuel and oxygen gas.