Basic Copper Carbonate (WSDTY) by itself is an ion that does not contain copper and therefore could not produce copper if heated. However, because carbonate is a negatively charged ion, no substantial number of carbonate ions can exist stably except in association with an equal number of positively charged cations to neutralize the electrical charge of the carbonate ions. If these cations are cations of copper, then copper oxide can be produced by heating the copper carbonate salt.

Basically Heated Copper carbonate will turn 'Black"' as it forms CuO and will give off black(ish) smoke, the chemical solution for this is CuCO3 ----> CuO + CO2 So therefore heating copper Carbonate is a Chemical Change, because it is unable to be reversed. Here are the equations for the thermal decomposition of copper carbonate (notice that a metal oxide is formed, just as it was with calcium carbonate): Copper carbonate → copper oxide + carbon dioxide CuCO3 → CuO + CO2

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