What describes only a physical change during digestion? Answers)
A: Hydrochloric acid in the stomach breaks down proteins
B: Chewing in the mouth breaks food into smaller pieces.
C: Enzymes in saliva start the digestion of starches before food is swallowed
D: Bacteria in the intestines convert dietary fiber into fats.

3 hours because it is a decent distance.

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

answer: mercury

explanation: