The physical or chemical form of matter can be changed.
The conservation of matter.
When rocks change form in the rock cycle, we see an example of the conservation of mass. This principle states that the total mass of the rock remains constant throughout the cycle, even as it undergoes various processes such as weathering, erosion, and sedimentation.
Law of Conservation of Mass
Matter
Law of Conservation of Matter.
Conservation laws suggest that energy, matter, and momentum cannot be created or destroyed but can only change forms or be transferred between objects. Conservation of energy states that the total energy in a closed system remains constant. Conservation of matter indicates that the total mass in a closed system is constant. Conservation of momentum asserts that the total momentum of an isolated system remains constant in the absence of external forces.
matter
matter
Matter
Matter
Matter
You are confusing the law of conservation of matter/mass with the law of conservation of energy. The law of conservation of matter/mass states that in a closed system matter is neither created nor destroyed. During a chemical reaction matter is rearranged, it doesn't change forms (energy can change forms). The atoms in the products are the same atoms that were in the reactants.