Multiple Choice
Which of the following experiments best demonstrates that mass is conserved during a chemical reaction?
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2. Atoms & Elements
Law of Conservation of Mass
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Which of the following is conserved in chemical reactions according to the Law of Conservation of Mass?
A
Mass
B
Number of molecules
C
Volume
D
Temperature
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a chemical reaction; it remains constant throughout the process.
Recognize that while the number of molecules, volume, and temperature can change during a reaction, the total mass of the reactants equals the total mass of the products.
Recall that the number of molecules may change due to rearrangement or formation of new substances, so it is not conserved.
Note that volume can vary depending on the state of matter and conditions like pressure and temperature, so it is not conserved.
Conclude that the quantity conserved according to the Law of Conservation of Mass is the mass itself.
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