PLEASE HELP :(( What happens to the potential energy of the molecules in a reaction?
A. The reactants only lose potential energy when forming products.
B. The potential energy of the molecules does not change in a
reaction.
C. The potential energy of the molecules changes during a reaction.
D. The potential energy of the products is equal to that of the
reactants.

here u go its C and then reason is below :)

Explanation:

What happens to the potential energy of the molecules in a reaction?

In an exothermic chemical reaction, potential energy is the source of energy. During an exothermic reaction bonds break and new bonds form and protons and electrons go from a structure of higher potential energy to lower potential energy. During this change, potential energy is converted to kinetic energy, which is the heat released in reactions.

C

Explanation:

in most reaction the potential energy is released as heat

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.