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

• A. Balancing chemical equations is only necessary for reactions involving gases.
• B. Balancing chemical equations allows for the creation or destruction of atoms during a reaction.
• C. Balancing chemical equations is unrelated to the law of conservation of mass.
• D. Balancing chemical equations ensures that the total mass of reactants equals the total mass of products, reflecting the law of conservation of mass.

Answer: (D)

Verified step by step guidance

1. Understand the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction; it can only be rearranged.
2. Recognize that a chemical equation represents the reactants and products of a reaction using chemical formulas and symbols.
3. Balancing a chemical equation means adjusting the coefficients (the numbers in front of formulas) so that the number of atoms of each element is the same on both sides of the equation.
4. By balancing the equation, you ensure that the total number of atoms—and therefore the total mass—of reactants equals that of the products, which directly reflects the law of conservation of mass.
5. Therefore, balancing chemical equations is essential to accurately represent the conservation of mass during chemical reactions, regardless of the physical state of the substances involved.