Jan propped up a graham cracker in a shallow bowl . she then set up an electric fan to blow on the graham cracker at three different speeds what is jans dependent variable in his experiment

The amount of cracker crumbs produced.

a. hope i'm right

explanation:

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