The scientists used the Law of Conservation of Mass, which says that matter can't be created or destroyed in a chemical reaction. This means the total weight of the reactants (copper and sulfur) will equal the weight of the products (copper sulfide), so they expected 15.9 grams of Cu2S.
Use the chemical equation to complete the activity. 2Cu + S ---> Cu2S. Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation a scientist adds 12.7 grams of Cu to 3.2 G of S to start the reaction. In this reaction all of the copper and all of the sulfur react before running the experiment the scientists expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S) in1 - 2 sentences explain the law that the scientists use to predict that the product of the reaction will be a total of 15.9 grams of copper sulfide.
Write your answer very shortly, and in 7th grader words plz.
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