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Which quantity is always conserved during all chemical reactions according to the Law of Conservation of Mass?
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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 happens to the total mass of substances during a physical change?
A
The total mass remains unchanged.
B
The total mass decreases.
C
The total mass fluctuates unpredictably.
D
The total mass increases.
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Recall the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a closed system during any physical or chemical process.
Understand that a physical change involves changes in the state or appearance of a substance without altering its chemical composition (e.g., melting, freezing, dissolving).
Since no atoms are lost or gained during a physical change, the total number of atoms—and therefore the total mass—remains constant.
Express this concept mathematically as: \(\text{Mass}_{\text{initial}} = \text{Mass}_{\text{final}}\) during a physical change.
Conclude that the total mass of substances remains unchanged during a physical change, consistent with the Law of Conservation of Mass.
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