Write the equations for the reactions between the following substances: iron + hydrochloric acid, sulfuric acid + sodium hydroxide, barium nitrate + sodium sulfate, aluminum chloride + potassium hydroxide
1) .Fe + .2HCl = FeCl2 + H2.
2) .H2SO4 + 2NaOH = Na2SO4 + 2H2O.
3) .Ba (NO3) 2 + Na2SO4 = BaSO4 + 2NaNO3.
4) .AlCl3 + 3NaOH = .Al (OH) 3 + 3NaCl.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.