us the chemical equation to complete the activity.
2Cu + S + Cu2S
cooper (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.
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. According to this law, the mass of the reactants must equal the mass of the products in a chemical reaction.
how are chemical changes different from physical change?
a. they form new substances
b. they involve heat
c. they include shifts in the phase of matter
d. they are reversible
a. they form new substances
Chemical changes involve the formation of new substances with different chemical properties, whereas physical changes do not result in the formation of new substances. Physical changes, on the other hand, may involve changes in physical state or appearance, but the chemical composition of the substance remains the same.