Question

CaCO3 →   CO2  →    К 2CO3     →  K2SiO3                  

Answer 1

CaCO3 → CO2 → K2CO3 → K2SiO3

1) CaCO3 → CaO + CO2↑ (при высокой температуре, над стрелкой t)
2) CO2 + K2O → K2CO3
3) K2CO3 + SiO2 → K2SiO3 + CO2 

Answer 2

The chemical reaction involves several steps:

1. CaCO3 (calcium carbonate) decomposes to form CO2 (carbon dioxide) and CaO (calcium oxide):
CaCO3 → CaO + CO2

2. The CO2 (carbon dioxide) is then reacted with K2O (potassium oxide) to form K2CO3 (potassium carbonate):
CO2 + K2O → K2CO3

3. Finally, the K2CO3 (potassium carbonate) is reacted with SiO2 (silicon dioxide) to form the desired product K2SiO3 (potassium silicate):
K2CO3 + SiO2 → K2SiO3

Overall reaction:
CaCO3 + SiO2 → K2SiO3 + CO2