Question

The Law of Conservation of Mass-During a chemical reaction ____ .

• A. the sum of the masses of all reactants is not equal to sum of masses of all products.
• B. the sum of masses of all reactants is equal to the sum of masses of all products.
• C. the sum of the masses of all reactants is equal to half of sum of masses of all products.
• D. the sum of masses of all reactants is equal to double of sum of masses of all products.

Hint:

The Law of Conservation of Mass is often demonstrated by balancing chemical equations, where the number of atoms of each element remains constant on both sides of the reaction.

Answer 1

The Correct Option is B

Step 1: Understand the Law of Conservation of Mass.
The Law of Conservation of Mass is a fundamental principle in chemistry. It states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. Step 2: Apply the law to a chemical reaction.
In the context of a chemical reaction, this law means that the total mass of the reactants before the reaction must be equal to the total mass of the products after the reaction. Atoms are rearranged, but their total quantity and mass remain constant. Step 3: Evaluate the given options based on the law.

(1) the sum of the masses of all reactants is not equal to sum of masses of all products: This statement contradicts the Law of Conservation of Mass.
(2) the sum of masses of all reactants is equal to the sum of masses of all products: This statement accurately reflects the Law of Conservation of Mass.
(3) the sum of the masses of all reactants is equal to half of sum of masses of all products: This statement contradicts the Law of Conservation of Mass.
(4) the sum of masses of all reactants is equal to double of sum of masses of all products: This statement contradicts the Law of Conservation of Mass. Step 4: Conclude the correct statement.
The Law of Conservation of Mass states that during a chemical reaction, the sum of the masses of all reactants is equal to the sum of the masses of all products. (2) the sum of masses of all reactants is equal to the sum of masses of all products.