The statement "The total mass of materials is not affected by a chemical change in those materials" is called a(n)

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The statement is a fundamental principle of chemistry known as the Law of Conservation of Mass, which states that the total mass of the reactants in a chemical reaction is equal to the total mass of the products. This is a natural law, as it has been consistently observed and verified through numerous experiments and observations. It is distinct from a theory, which is a proposed explanation for observed phenomena, and from an observation, which is simply a notice of something that has been seen or experienced. While measurements and experiments are important in validating the Law of Conservation of Mass, they are not the statement itself.

The Statement "The Total Mass of Materials Is Not Affected