As Jose mixed two substances in a test tube, he noticed that the test tube became warm. He also noticed an odor coming from the test tube. Based on Jose's observations, what was most likely occurring inside the test tube?

Question

A.
The substances were melting.

B.
The substances were evaporating.

C.
The substances were undergoing a chemical reaction.

D.
The substances were undergoing an endothermic reaction.

Answer 1

C. The substances were undergoing a chemical reaction.