Question

Give an example of a reaction where the colour change is noticed ?

Answer 1

Answer:

Color changes from blue to light green. Copper reacts with oxygen, H2O and CO2 to give copper carbonate, which changes color from brown to blue or blue green. Rusting, blackening of surfaces of cut vegetables and fruits are other examples of change of color in a chemical reaction.

Explanation:

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Answer 2

Answer:

The reaction between Copper{Cu}(brown in colour) when react with Oxygen it will form Copper oxide{CuO} (black in colour):-

Cu+O2------→CuO

The balanced chemical reaction will be:-

2Cu+O2------→2CuO