Question

С→ CO2→Na2CO3→ CO2→ СаСО3

Answer 1

1) C + O₂ = CO₂

2) CO₂ + 2NaOH = Na₂CO₃ + H₂O

3) Na₂CO₃ + 2HCl = 2NaCl + CO₂ + H₂O

4) CO₂ + Ca(OH)₂ = CaCO₃ + H₂O

Answer 2

1) С + О2 = СО2;

2) СО2 + Na2O = Na2CO3;

3) Na2CO3 + 2 HCl = 2 NaCl + CO2♤ +H2O;

4) CO2 + CaO = CaCO3

♤ - виділяється газ

Answer 3

The chemical reactions you've provided appear to describe a series of processes involving the conversion of carbon compounds. Let's break down each step:

1. C → CO2: This represents the combustion of carbon (C) to produce carbon dioxide (CO2). It's a common reaction when burning organic matter or fossil fuels.

2. CO2 → Na2CO3: This is the reaction of carbon dioxide (CO2) with sodium hydroxide (NaOH) to form sodium carbonate (Na2CO3). The reaction can be written as follows: CO2 + 2 NaOH → Na2CO3 + H2O

3. Na2CO3 → CO2: This step likely represents the decomposition of sodium carbonate (Na2CO3) into carbon dioxide (CO2) when heated. The reaction can be written as: Na2CO3 → CO2 + Na2O

4. CO2 → CaCO3: This is the conversion of carbon dioxide (CO2) into calcium carbonate (CaCO3) through a process called carbonation. This reaction typically occurs in the presence of water and calcium-containing substances. For example, in nature, carbon dioxide dissolves in rainwater, forming a weak carbonic acid (H2CO3), which reacts with calcium-containing minerals to form calcium carbonate (CaCO3).

Please note that the symbols and notations used might not be standard chemical notation, but the interpretation provided above is based on common chemical reactions. If you have any specific context or intended purpose for these reactions, please feel free to elaborate, and I'll be happy to provide further information.