The scientist used the Law of Conservation of Mass to guess that the reaction would create 15.9 grams of copper sulfide. This law means that in a chemical reaction, stuff can't just disappear or show up out of nowhere. So, the total weight of the things that go into the reaction (called reactants) has to equal the total weight of what comes out (called products).
rewrite as a 7th grader.
The scientist used the Law of Conservation of Mass to predict that the product of the reaction would be 15.9 grams of copper sulfide. This law states that matter cannot be created or destroyed in a chemical reaction, thus the total mass of the reactants must be equal to the total mass of the products.
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