Question

geraldos science teacher mixed liquid x and liquid y, both at room - temperature, in a large beaker.
the mixture in the large beaker will 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. a chemical reaction produced a new substance.
b. the release of a gas heated the solution.
c. the energy of mixing warmed the liquids.
d. the two liquids were not soluble in water.

Explanation:

When two substances react chemically and release heat (exothermic reaction), the container can feel warm. Here, a chemical reaction between liquid X and liquid Y likely produced a new substance and released heat, warming the beaker. There is no indication of a gas heating the solution, mixing energy isn't enough to cause significant warming in this context, and solubility in water is not relevant to the warming phenomenon.

Answer:

A. A chemical reaction produced a new substance