ZnCO3, when heated in the absence of air, decomposes to give ZnO and CO2. I think this is the answer.
Sulfur is melted.
coal tar
It expands.
It turns into tutti
When magnesium is heated in air, it forms magnesium oxide and so the total mass increases.
Sulfur is melted.
when the carbonate is heated in absence of air then the CO2 is produced as the byproduct .
ZnCO3 --------> ZnO + CO2.It is an example of decomposition reaction.Colour of zinc oxide produced is yellow when hot and white when cold.
Sulfur is melted.
coal tar
It expands.
It expands.
global warming
It turns into tutti
When magnesium is heated in air, it forms magnesium oxide and so the total mass increases.
The cool air will sink and the warm air will rise.
In air all are oxydated.