Practice Test

Question 6 • Physical Science

Which statement best describes balancing equations and the law of conservation of mass?

Answer

There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.

The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.

There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.

Explanation

Balancing a chemical equation makes the number of each kind of atom equal on both sides. Since atoms are conserved during a chemical reaction, the total mass of the reactants also equals the total mass of the products. Therefore, choice B, “The number of atoms is the same ... and the total mass is the same,” is correct.

AI-written and checked against the verified answer.

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