Question

there is a law that explains that matter cannot be created nor destroyed. what do we call this law? law of conservation of matter law of energy

Explanation:

The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction. It only changes form. The Law of Energy (more accurately, the Law of Conservation of Energy) states that energy cannot be created or destroyed, but can be converted from one form to another. Since the question is about matter, the relevant law is the Law of Conservation of Matter.

Answer:

Law of Conservation of Matter