Which statement is true of a chemical change? a) it involves changes in the molecular structure. b) it involves changes in phase but not changes in the molecular structure. c) it involves dissolving one substance into another. d) it involves a change in the state, or phase, of a substance. e) it involves the process of separating two or more dissolved substances.

h let me think

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e