* Formation of New Substances: When sodium carbonate and copper sulfate are mixed, they react to form copper carbonate (CuCO₃), a blue-green precipitate, and sodium sulfate (Na₂SO₄), which remains dissolved in the solution. This formation of entirely new substances is a key characteristic of chemical change.
* Irreversible Reaction: The reaction is not easily reversed. You can't simply separate the copper carbonate and sodium sulfate back into their original components by simple physical means.
* Evidence of a Change: You'll see visual evidence of the chemical change, such as the formation of the blue-green precipitate and a possible change in temperature.
The Balanced Chemical Equation:
Na₂CO₃ (aq) + CuSO₄ (aq) → CuCO₃ (s) + Na₂SO₄ (aq)
In summary: The reaction between sodium carbonate and copper sulfate involves the formation of new substances, is irreversible, and shows clear evidence of a change. Therefore, it is classified as a chemical change.
