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Painting a wo...

Question

Painting a wooden block or wall is a chemical change or not as there is a change in colour?

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Solution

The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring. Painting the metal car does not changing the composition of the metallic substance

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