Multiple Choice
According to the Law of Conservation of Mass, which of the following best explains why the mass of a closed system remains unchanged during a chemical reaction?
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2. Atoms & Elements
Law of Conservation of Mass
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Which statement best describes the Law of Conservation of Mass during a chemical change?
A
The total mass of the products is equal to the total mass of the reactants.
B
The products always have a greater mass than the reactants.
C
The reactants always have a greater mass than the products.
D
Mass is not conserved during a chemical reaction.
Verified step by step guidance1
Understand that the Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction.
Recognize that during a chemical change, atoms are rearranged but the total number of atoms remains the same.
Therefore, the total mass of all reactants before the reaction must be equal to the total mass of all products after the reaction.
This means that no matter what chemical change occurs, the mass measured before and after the reaction remains constant.
Hence, the correct description is that the total mass of the products is equal to the total mass of the reactants.
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