Write the reaction equations CH4-CO2-Na2CO3-CaCO3

Let us give the reaction equations for the chain of transformations:
СН4 + 2О2 = СО2 + 2Н2О – the reaction of methane combustion occurs with the release of heat, exothermic, its products are carbon monoxide and water;
CO2 + 2NaOH = Na2CO3 + H2O – ion exchange, sodium carbonate was obtained;
Na2CO3 + CaCl2 = 2NaCl + CaCO3 – ion exchange, calcium carbonate is formed in the sediment.
These reactions show the relationship between organic and inorganic substances. The substances involved in the reactions are of practical importance. Methane is a fuel, salts and carbonates are part of cement and are used in construction.