Question

Ca → Ca(OH)2 →CaCO3 → CO2​

Answer 1

1. Ca + 2H₂O → Ca(OH)₂ + H₂

2. Ca(OH)₂ + Na₂CO₃ → СaCO₃ + 2NaOH

3. CaCO₃ →t°C CaO + CO₂

Answer 2

It seems like you're describing a series of chemical reactions involving calcium (Ca) and the formation of calcium hydroxide (Ca(OH)2), calcium carbonate (CaCO3), and carbon dioxide (CO2). Let me break down these reactions for you:

1. Formation of Calcium Hydroxide (Ca(OH)2):

   • Ca + 2H2O → Ca(OH)2
   • In this reaction, calcium (Ca) reacts with water (H2O) to form calcium hydroxide (Ca(OH)2).

2. Formation of Calcium Carbonate (CaCO3):

   • Ca(OH)2 + CO2 → CaCO3 + H2O
   • Calcium hydroxide (Ca(OH)2) reacts with carbon dioxide (CO2) to produce calcium carbonate (CaCO3) and water (H2O).

3. Release of Carbon Dioxide (CO2):

   • CaCO3 → CaO + CO2
   • Calcium carbonate (CaCO3) decomposes into calcium oxide (CaO) and carbon dioxide (CO2).

So, in this sequence of reactions, calcium reacts with water to form calcium hydroxide, which then reacts with carbon dioxide to produce calcium carbonate, and finally, calcium carbonate decomposes to release carbon dioxide. These reactions are important in various chemical processes and natural phenomena, such as the formation of limestone in nature.