Which term describes matter is not created nor destroyed in any chemical or physical change?

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

Answer: (A)

Matter isn’t created or destroyed during a chemical or physical change; the total amount of mass stays the same because atoms are just rearranged into new substances. This idea is described by the Law of Conservation of Mass. In a sealed system, melting ice, dissolving salt, or a chemical reaction like burning fuel all show that the mass before equals the mass after. If a system isn’t closed and gases escape, it can look like mass is lost, but in a closed setup the total mass is preserved. Other laws talk about energy, gravity, or electric charge, which are about different properties and do not state that the amount of matter remains constant.