Copper reacts with sulfur to form copper sulfide. As shown in the equation 2CU + S yields CU2SA scientist adds 12.7 g of CU to 3.2 g of S to start the reaction in this reaction, all of the copper and all of the suffer react before running the experiment, the scientists expected the products of the reaction. To will be total of 15.9 g of copper sulfide CU2S in 1 to 2. Sentences explain the law that the scientist used to reject that the product of the reaction would be 15.9 g.

Answer 1

The scientist used the law of conservation of mass to reject that the product of the reaction would be 15.9 g of copper sulfide. According to this law, mass cannot be created or destroyed during a chemical reaction. Since the total mass of the reactants (12.7 g of copper + 3.2 g of sulfur = 15.9 g) is equal to the expected mass of the product, it indicates that all of the reactants have fully reacted to form the copper sulfide product.