Which of the following statements correctly describes the law of conservation of energy? group of answer choicesa. mass cannot be created but it can be destroyed under extreme pressures. b. mass cannot be conserved during a chemical reaction; a little bit of mass is always lost. c. the mass of a closed system cannot change over time; mass cannot be created nor destroyed. d. when added to a system, energy can destroy mass.

To solve this problem we will also apply the concept related to the conservation of the mass, which announces that: "In an isolated system, during any ordinary chemical reaction, the total mass in the system remains constant, that is, the mass consumed by the reagents is equal to the mass of the products obtained. "

If the mass is in a closed system, it cannot change. This assessment should not be confused with the transformation of the matter within it, for which it is possible that over time the matter will change from one form to another. For example during a chemical reaction, there is a rupture of links to reorganize into another, but said mass in the closed system is maintained.

The correct answer is:

C. "The mass of a closed system cannot change over time; mass cannot be created or destroyed."