Which is the best evidence that a chemical change has occurred? a. change of state b. release of energy c. temperature change d. formation of a new substance

The answer to your question is: letter D.

Explanation:

Chemical change is when one substance combines with another one to form a new one.

A. change of state  this is a physical change, there is not hte formation of a new compound.

B. release of energy this is not a evidence of a chemical change, this option is wrong.

C. temperature change this is not a characteristic of a chemical change, this is not the right answer.

D. formation of a new substance this is the correct answer is the main characteristic of a chemical change.