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 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide. (2 points) can you make this short and sound like a 6th grader please

Answer 1

The scientist used the law of conservation of mass, which says that in a chemical reaction, the total mass of the reactants (the starting materials) will equal the total mass of the products. So, since they started with 12.7 grams of copper and 3.2 grams of sulfur, the total mass is 15.9 grams, which they expected to be the mass of the copper sulfide formed.