The equation 2MnCO3 -> 2MnO2 + 2CO2 + 2O2

The above chemical equation describes the decomposition process of manganese carbonate (MnCO₃) when heated. The result of the reaction is the compound manganese(IV) oxide (MnO₂), carbon dioxide gas (CO₂), and oxygen gas (O₂).

Reaction Conditions: This reaction requires a high temperature to occur.

Reaction Process: In a container holding manganese carbonate, when the temperature is increased, the MnCO₃ molecules begin to decompose, separating into 2 moles of manganese(IV) oxide, 2 moles of carbon dioxide gas, and 2 moles of oxygen gas. The reaction continues until the manganese carbonate in the container is exhausted.

Observed Phenomenon: When the temperature is increased, you will see the color change of manganese carbonate from light pink to the brown-black of manganese(IV) oxide. Simultaneously, gas rising from the container confirms the formation of carbon dioxide and oxygen gases.