The mixture in the large beaker still looked clear like water, but when the students, one at a time, carefully touched the outside of the large beaker, it felt warm to the touch. Why did the large beaker most likely feel warm?
A.
The release of a gas heated the solution.
B.
The two liquids were not soluble in water.
C.
The energy of mixing warmed the liquids.
D.
A chemical reaction produced a new substance.