Question

A white powder is added to a solution. The images show observations made before the powder is added, just after the powder has been added, and a little while later. (The liquid in the small beaker is phenol red solution.) What evidence shows that a chemical change has taken place?

Answer 1

D.All of above. Hope it helps!!!

Answer 2

Change in colour as well as liberating gas are the evidences that chemical reaction or change taken place.

The change in colour of the solution provides us information or evidence is that chemical change has taken place. There are many other ways which provides evidence of taking place of chemical change is the release of gas from the solution after adding powder or any substance.

There are some reactions in which new substance is formed which is also an identification of chemical change so we can conclude that change in colour as well as liberating gas are the evidences that chemical reaction or change taken place.

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