Which of the following statements is true in all cases? a. chemical bonds are broken in an exothermic reaction. b. chemical bonds are formed in an endothermic reaction c. energy is released in an endothermic reaction. d. energy is absorbed in an endothermic reaction.

D. Energy is absorbed in an endothermic reaction

Explanation:

In all cases, an endothermic reaction is one in which is absorbed from the surroundings for the reaction to take place. After the reaction, the surrounding becomes colder as heat is drawn from it to furnish the reaction.

It is in an exothermic reaction that heat is liberated to the surroundings and this makes the surrounding hotter at the end of the reaction.

In some reactions, when bonds are broken, they can release energy and they can also absorb energy.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.