Question

Ca---CaO----CaCO3----CO2

Answer 1

2Ca+O2=2CaO
CaO+CO2=CaCO3
CaCO3=CaO+CO2

Answer 2

2Ca+O2=2CaO
CaO+CO2=CaCO3
CaCO3=CaO+CO

Answer 3

The sequence you provided represents a series of chemical reactions involving calcium (Ca), calcium oxide (CaO), calcium carbonate (CaCO3), and carbon dioxide (CO2). Let's break down each step:

1. Formation of Calcium Oxide (CaO): Calcium oxide is formed through the reaction of calcium (Ca) with oxygen (O2) in the air. The balanced equation for this reaction is:

2 Ca + O2 → 2 CaO

2. Formation of Calcium Carbonate (CaCO3): Calcium oxide (CaO) reacts with carbon dioxide (CO2) to produce calcium carbonate (CaCO3). The balanced equation for this reaction is:

CaO + CO2 → CaCO3

3. Decomposition of Calcium Carbonate (CaCO3): When calcium carbonate (CaCO3) is heated, it decomposes into calcium oxide (CaO) and carbon dioxide (CO2). The balanced equation for this reaction is:

CaCO3 → CaO + CO2

In summary, the overall process can be represented by the following sequence:

Ca + O2 → CaO CaO + CO2 → CaCO3 CaCO3 → CaO + CO2

This series of reactions shows the transformation of calcium into calcium oxide, then the formation of calcium carbonate from calcium oxide and carbon dioxide, followed by the decomposition of calcium carbonate back into calcium oxide and carbon dioxide.