Multiple Choice
According to the Law of Conservation of Mass, what happens to the total mass of substances during a chemical change?
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2. Atoms & Elements
Law of Conservation of Mass
Multiple Choice
According to the Law of Conservation of Mass, what quantity remains unchanged during a chemical reaction?
A
The number of molecules of each substance
B
The total mass of the reactants and products
C
The volume of the system
D
The temperature of the reaction mixture
Verified step by step guidance1
Recall the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a chemical reaction.
Understand that during a chemical reaction, atoms are rearranged but the total number of atoms remains the same.
Recognize that because atoms have mass, the total mass of all reactants before the reaction must equal the total mass of all products after the reaction.
Note that quantities like the number of molecules of each substance, volume, or temperature can change during the reaction, but the total mass remains constant.
Conclude that the quantity that remains unchanged during a chemical reaction, according to the Law of Conservation of Mass, is the total mass of the reactants and products.
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