Chemical Reactions happen when there is a color change, heat change, gas produced, and precipitate is formed. Precipitate is a solid that settles out. The parts of a chemical reaction are the reactants, substances that interact and are on the left side. The formula for that is Zn + 2HCI--------- ZnCl + H2.
The five general types are:
-synthesis
-decomposition
-single displacement
-double displacement
-combustion
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