1. Types of Chemical Reactions

2. Synthesis Reaction- when 2 or more substances combine to form a new substance.
Ex:
Na + Cl → NaCl
Mg + O → MgO

3. Decomposition Reaction- when 1 substance breaks down into 2 or more simpler substances.
Ex:
NaCl → Na + Cl
MgO → Mg + O

4. 3.Single-replacement Reaction-when 1 element replaces another in a compound.
Na+1Cl-1 + K+1 → K+1Cl-1 + Na+1
Compound Element Compound Element

5. 4. Double-Replacement Reaction- when the positive ions of the compounds switch with each other to make 2 new compounds.
Na+1Cl-1 +Li+1F-1 → Li+1Cl-1 + Na+1F-1

6. Exothermic Reaction- a reaction where some form of energy (in the form of heat) is given off by the reaction.
-There is an increase in temperature.

7. Endothermic Reaction- a reaction where energy must be provided for the reaction to take place.
-There is an decrease in temperature.