Multiple Choice
According to the Law of Conservation of Mass, why does the mass of a substance remain the same after a chemical reaction?
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2. Atoms & Elements
Law of Conservation of Mass
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According to the Law of Conservation of Mass, what is conserved during a chemical reaction?
A
The volume of the system
B
The temperature of the reactants
C
The number of molecules of each substance
D
The total mass of the reactants and products
Verified step by step guidance1
Understand the Law of Conservation of Mass: It states that mass is neither created nor destroyed in a chemical reaction.
Recognize that during a chemical reaction, atoms are rearranged but the total number of atoms remains the same.
Since 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 other properties like volume, temperature, or the number of molecules of each substance can change during the reaction and are not conserved.
Therefore, the quantity conserved according to the Law of Conservation of Mass is the total mass of the reactants and products.
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