Question

Which of these observations is an indication that a chemical reaction has occurred?

A. Color change
B. Bubble formation
C. Change in temperature
D. Precipitate formation
E. Salt dissolving

Answer 1

Answer: Correct option is A. Color Change

Explanation: Chemical change involves chemical reactions and the creation of new products. Typically, a chemical change is irreversible. Change of color is an irreversible effect that shows chemical reaction.