Question

C-CO2-H2CO3-CaCO3-CaO

Answer 1

C+O2=CO2
CO2+H2O=H2CO3
H2CO3+Ca(OH)2=CaCO3+2H2O
CaCO3=CaO+CO2

Answer 2

Chemical Reactions: C-CO2-H2CO3-CaCO3-CaO

The chemical reactions involving C (carbon), CO2 (carbon dioxide), H2CO3 (carbonic acid), CaCO3 (calcium carbonate), and CaO (calcium oxide) can be represented as follows:

1. C + CO2 → 2CO: This reaction represents the formation of carbon monoxide (CO) from carbon (C) and carbon dioxide (CO2).

2. CO2 + H2O ⇌ H2CO3: Carbon dioxide (CO2) can react with water (H2O) to form carbonic acid (H2CO3). This reaction is reversible, meaning carbonic acid can also decompose back into carbon dioxide and water.

3. CaCO3 + 2HCl → CaCl2 + H2CO3: Calcium carbonate (CaCO3) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl2) and carbonic acid (H2CO3).

4. CaO + CO2 → CaCO3 [[5]](https://invat.blob.core.windows.net/manuals/9%20%D0%BA%D0%BB%D0%B0%D1%81%D1%81-ru-%D0%A5%D0%B8%D0%BC%D0%B8%D1%8F-2016-.pdf) [[6]](https://elar.urfu.ru/bitstream/10995/40625/1/978-5-7996-1780-6_2016.pdf): Calcium oxide (CaO) reacts with carbon dioxide (CO2) to produce calcium carbonate (CaCO3).

5. CaCO3 → CaO + CO2 [[8]](https://www.istu.edu/docs/education/faculty/zvf/ood/magistratyra/himiya/metodicheskie_ukazaniya_po_auditornym_zanyatiyam/uchebnik__avtor_budyak.pdf): Calcium carbonate (CaCO3) can also decompose into calcium oxide (CaO) and carbon dioxide (CO2).

These reactions demonstrate the interconversion between carbon, carbon dioxide, carbonic acid, calcium carbonate, and calcium oxide.