Question

Mg - MgO - MgCO3 - CO2 - CaCO3

Answer 1

2Mg + O2 = 2MgO

MgO + CO2 = MgCO3

MgCO3 = CO2 + MgO

CO2 + CaO = CaCo3

Answer 2

The sequence you provided represents a series of chemical reactions involving magnesium (Mg), magnesium oxide (MgO), magnesium carbonate (MgCO3), carbon dioxide (CO2), and calcium carbonate (CaCO3). Let's break down the reactions step by step:

1. Mg (magnesium) reacts with O2 (oxygen) in the air to form MgO (magnesium oxide): 2Mg + O2 -> 2MgO

2. MgO (magnesium oxide) reacts with CO2 (carbon dioxide) to form MgCO3 (magnesium carbonate): MgO + CO2 -> MgCO3

3. MgCO3 (magnesium carbonate) can decompose upon heating to form MgO (magnesium oxide) and release CO2 (carbon dioxide): MgCO3 -> MgO + CO2

4. CO2 (carbon dioxide) produced in the previous reaction can react with CaO (calcium oxide) or Ca(OH)2 (calcium hydroxide) to form CaCO3 (calcium carbonate) through a process called carbonation: CO2 + CaO -> CaCO3 CO2 + Ca(OH)2 -> CaCO3 + H2O

So, the overall sequence of reactions involving Mg, MgO, MgCO3, CO2, and CaCO3 is:

Mg + O2 -> MgO MgO + CO2 -> MgCO3 MgCO3 -> MgO + CO2 CO2 + CaO (or Ca(OH)2) -> CaCO3

This sequence describes the transformation of magnesium into magnesium oxide, magnesium carbonate, carbon dioxide, and ultimately the formation of calcium carbonate.