The first law of thermodynamics states that the energy of a system is always constant but the second law of thermodynamics entropy is always increasing and therefore increasing energy of the system and if the energy of the system is increasing then obviously they must violate the first law of thermodynamics how is this possible

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