Write your observation and a balanced equation for Copper carbonate being heated.

Light green amorphous powder changes to black. Carbon dioxide gas is given off which turns lime water milky.

$\underset{\text{[Copper carbonate (light green)]}}{\text{CuCO}$3} \overset{\Delta}{\longrightarrow} \underset{\text{[copper oxide - black]}}{\text{CuO}} + \underset{\text{[Carbon dioxide]}}{\text{CO}2\uparrow}