List the main types of chemical reactions. Give examples of relevant reaction equations.

Chemical reactions are divided into the following types. 1.According to the presence of a phase boundary, all chemical reactions are divided into homogeneous and heterogeneous. 2. By the change in the oxidation states of the reagents: in this case, redox reactions are distinguished. 3. By thermal effect: exothermic and endothermic. 4. By the type of transformations of the reacting particles. * compounds: 2Cu + O2 = 2CuO. * decomposition: 2HgO -> 2Hg + O2. * substitutions: Fe + CuSO4 = FeSO4 + Cu. * exchange: NaOH + HCl = NaCl + H2O. 5. On the basis of the direction of flow, chemical reactions are divided into irreversible and reversible.