Q1 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 mass cannot be created or destroyed in a chemical reaction, so the total mass of the reactants must be equal to the total mass of the products.
Q2 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, mass is conserved in a chemical reaction, so the total mass of the reactants should be equal to the total mass of the products.
Chemical Change Unit Test answers
Q1 Which element has the same number of valence electrons as bromine (Br)?
A chlorine (Cl).
Q2 Why are sodium (Na) and potassium (K) in the same group on the periodic table?
A They have similar reactivity.
Q3 Which option is an example of a chemical change?
A burning wood
Q4 A student cuts some fabric into two pieces. Is this change physical or chemical?
A It is a physical change because the process is reversible.
Q5 How are chemical changes different from physical changes?
A They form new substances.
Q6 How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
A it shows that no atoms have been gained or lost during the reaction
Q7
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
A (I'm sorry but you have to do it yourself :( )
Credit (both are from Brainly)
Q1 onyebuchinnaji
Q2 ashwinvt
1 answer
1 answer