Question

Q. CuCo3 when heated gives CuO and CO2 .
Give reason why it is considered as chemical changes.​

Answer 1

Answer:

Anything that results in a change to the chemical structure of the substance (i.e. a chemical reaction occurs and new substance/s are formed) is a chemical change.

So if you heat copper carbonate to a temperature below its temperature of decomposition, it is a physical change. If you take the copper carbonate to its temperature of decomposition, then its a chemical change.

Below the temperature of decomposition (~290 degrees celcius) you are simply changing the temperature of the compound. Once the temperature of decomposition is reached the copper carbonate breaks down into copper (II) oxide and carbon dioxide. So that's a chemical change.

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Answer 2

*Answer*

CuCo3 - CuO + Co2

This equation shows copper carbon trioxide gives rise to copper oxide and liberated carbon dioxide.

Here chemical action takes place by changing of the state and also liberate a new gas.
Therefore it is a Chemical reaction.
As SARVESHDSAWANT3 (username)said it is also as the Change in the temperature(~290 temperature).

*Explanation*

Determining of Chemical reaction Has taken place by the following results -
• Change in state
• Change in colour
• Evolution of gas
• Change in temperature