Law of conservation of matter: The amount of matter does not change before, after or during a chemical reaction or physical change. Law of conservation of energy: Energy cant be created or destroyed in a chemical reaction. Law of the conservation of matter and energy: The combined amount of matter and energy in the universe is fixed
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The difference is that the laws of conservation of matter and the conservation of energy talk about matter and energy as different and seperate. While the law of the conservation of matter and energy says that the 2 are connected and as a whole never changes.