Which law states that mass is conserved in chemical reactions?

Which law states that mass is conserved in chemical reactions?

• A. Law of Conservation of Energy
• B. Law of Gravity
• C. Law of Conservation of Mass
• D. Law of Thermodynamics

Answer: (C)

Matter can’t be created or destroyed in ordinary chemical reactions. The atoms you start with are the same atoms you end up with, just rearranged into new substances. Because of that, the total mass of the reactants equals the total mass of the products when the reaction occurs in a closed system. This idea is called the Law of Conservation of Mass, and it explains why careful weighing shows the same mass before and after a reaction under normal laboratory conditions. Other choices refer to energy, gravity, or thermal principles, which are different ideas; they don’t specifically state that mass remains constant in chemical changes.

Matter can’t be created or destroyed in ordinary chemical reactions. The atoms you start with are the same atoms you end up with, just rearranged into new substances. Because of that, the total mass of the reactants equals the total mass of the products when the reaction occurs in a closed system. This idea is called the Law of Conservation of Mass, and it explains why careful weighing shows the same mass before and after a reaction under normal laboratory conditions. Other choices refer to energy, gravity, or thermal principles, which are different ideas; they don’t specifically state that mass remains constant in chemical changes.