The 5 types of chemical reactions are combination, decomposition, single displacement, double displacement and combustion.
Combination chemical reactions are when two or more reactants combine to form a single product.
An example of combination chemical reaction is 2H2 + O2 -> 2H2O.
Decomposition chemical reactions are when a single reactant breaks down into multiple products.
An example of decomposition chemical reactions is CaCO3 -> CaO + CO2.
Single displacement chemical reactions are when one element replaces another in a compound.
An example of single displacement chemical reactions are Zn + CuSO4 -> ZnSO4 + Cu.
Double displacement chemical reactions are when two compounds exchange ions to form new compounds.
An example of double displacement chemical reactions are NaCl + AgNO3 -> AgCl + NaNO3.
Combustion chemical reactions are a rapid reaction with oxygen which produces heat and light.
An example of combustion chemical reactions would be when you light a stove or fire.
Another example of combustion chemical reactions are CH4 + 2O2 -> CO2 + 2H2O.
Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories.
Some reactions will fit into more than one category.