Make the reaction equation: C → CH4 → CO2 → CaCO3 →… → CaCO3 → CaO.

We carry out the following chain of reactions: C → CH4 → CO2 → CaCO3 →… → CaCO3 → CaO. We write down the reaction equations.

С-> CH4-> CO2-> CaCO3 -> …-> CaCO3-> CaO
1. We get methane from carbon. This reaction takes place under the influence of a catalyst and pressure.
C + 2H2 = CH4;

2. We get carbon dioxide from methane, combustion reaction.
CH4 + 2O2 = CO2 + 2H2O;
Let’s consider the reaction as a redox reaction.
C (-4) -8e = C (+4) 1 reducing agent, oxide – e;
O2 (0) + 4e = 2O (2-) 2 oxidizing agent, vos – e.

3. We get calcium carbonate from calcium oxide.
CaO + CO2 = CaCO3;

4. We get calcium chloride from calcium carbonate.
CaCO3 + 2HCl = CaCl2 + H2O + CO2;

5. We receive calcium carbonate from calcium chloride.
CaCl2 + Na2CO3 = 2NaCl + CaCO3 (precipitate);

6. We get calcium oxide from calcium carbonate. This reaction takes place by heating.
CaCO3 = CaO + CO2.