Q; What does the ;aw of Conservation of Mass state?
A. The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
B. Matter is neither created or destroyed in a chemical reaction, only rearranged.
C. Matter cannot be rearranged during a chemical reaction.
D. The total mass of reactants prior to a chemical reaction is greater than the mass of the product due to the release of energy.
Q; If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.
A. 32 grams
B. 0 grams
C. 28 grams
D. 30 grams
Q; 78 g of potassium(K) react with 71 g of chlorine (CI) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCI)
A. 4 g
B. 149 g
C. 2 g
D. 156 g
Q; 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of conservation of Mass, how many grams of potassium oxide (K2O) will be produced?
A. 10 grams
B. 7 grams
C. 2 grams
D. 5 grams
A. The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
C. 28 grams
B. 149 g
C. 2 grams
Q: What does the Law of Conservation of Mass state?
A: B. Matter is neither created nor destroyed in a chemical reaction, only rearranged.
Q: If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.
A: D. 30 grams
Q: 78 g of potassium (K) react with 71 g of chlorine (CI) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCI)?
A: B. 149 g
Q: 2 grams of potassium (K) reacts with 5 grams of oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?
A: D. 5 grams
The Law of Conservation of Mass states that matter is neither created nor destroyed in a chemical reaction, only rearranged. The total mass of all the reactants before a chemical reaction must equal the total mass of all the products after the reaction.
To answer the questions:
Q1: The correct answer is B. Matter is neither created nor destroyed in a chemical reaction, only rearranged.
Q2: The mass of elements before a chemical reaction is 30 grams, so the mass after the chemical reaction will still be 30 grams. The correct answer is D. 30 grams.
Q3: According to the Law of Conservation of Mass, the mass of the product (2KCI) will be equal to the total mass of the reactants. Adding the masses of potassium (78 g) and chlorine (71 g), we get 149 grams. So, the correct answer is B. 149 g.
Q4: To find the mass of potassium oxide (K2O) produced, we need to determine the total mass of potassium (K) and oxygen (O) in the reactants. Adding the masses of potassium (2 g) and oxygen (5 g), we get 7 grams. So, the correct answer is B. 7 grams.