Question

C-->CO2-->H2CO3-->Na2CO3-->CaCO3-->CO2

Answer 1

Ответ:

Объяснение:

С + О2 = СО2

СО2 + Н2О = Н2СО3

Н2СО3 +2 Na = Na2CO3 + H2

Na2CO3 + Ca(OH)2 = CaCO3 + 2NaOH

CaCO3 = CaO + CO2

Answer 2

The sequence you've provided appears to describe a series of chemical reactions involving carbon dioxide (CO2) and various compounds. Let's break down the reactions step by step:

1. C --> CO2: This step represents the combustion or oxidation of carbon (C) to form carbon dioxide (CO2). This reaction typically occurs when carbon-containing substances, such as wood or fossil fuels, are burned in the presence of oxygen.

2. CO2 --> H2CO3: This step represents the dissolution of carbon dioxide (CO2) in water (H2O) to form carbonic acid (H2CO3). Carbon dioxide can react with water to create a weak acid called carbonic acid, which plays a role in various chemical processes, including the carbonation of beverages.

3. H2CO3 --> Na2CO3: This step represents the neutralization of carbonic acid (H2CO3) with sodium hydroxide (NaOH) to form sodium carbonate (Na2CO3). This is a double displacement reaction where the hydrogen ions (H+) from the acid react with the hydroxide ions (OH-) from the base to produce water, and the sodium ions (Na+) from the base react with the carbonate ions (CO3^2-) from the acid to form sodium carbonate.

4. Na2CO3 --> CaCO3: In this step, sodium carbonate (Na2CO3) reacts with calcium chloride (CaCl2) or a similar calcium-containing compound to form calcium carbonate (CaCO3). This is a double displacement reaction, where the sodium ions (Na+) from sodium carbonate are replaced by calcium ions (Ca^2+) to form calcium carbonate.

5. CaCO3 --> CO2: This final step represents the decomposition of calcium carbonate (CaCO3) to form carbon dioxide (CO2). This reaction can occur when calcium carbonate is heated, releasing carbon dioxide gas and leaving behind calcium oxide (CaO), which is known as quicklime.

Overall, this sequence of reactions describes how carbon (in the form of C) can eventually be converted into carbon dioxide (CO2) through various chemical transformations, including combustion, dissolution, neutralization, and decomposition. The intermediates in the process include carbonic acid (H2CO3), sodium carbonate (Na2CO3), and calcium carbonate (CaCO3).