Write the reaction equations corresponding to the scheme: C-CO2-Na2CO3-CaCO3-CO2

C → CO2 → Na2CO3 → CaCO3 → CO2

1) C + O2 = CO2 ↑ (compound reaction; carbon, oxygen, carbon dioxide);
2) CO2 + 2NaOH = Na2CO3 + H2O (substitution reaction; carbon dioxide, sodium hydroxide, sodium carbonate, water);
3) CaSO4 + Na2CO3 = CaCO3 ↓ + Na2SO4 (exchange reaction; calcium sulfate, sodium carbonate, calcium carbonate, sodium sulfate);
4) CaCO3 → CaO + CO2 ↑ (decomposition reaction; calcium carbonate, calcium oxide, carbon dioxide).

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