Does this reaction release or absorb energy? release absorb neither how many transition states occur during this reaction? could this be an elementary reaction? yes no if you said this reaction could not be elementary, then how many steps are in its mechanism? if you said this reaction could not be elementary, then enter the number of the step in its mechanism which is rate-determining. for example, if the first step is the rate-determining step, enter "1" here.

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

a corroding iron, if that's one of your choices