Multiple Choice
According to the Law of Conservation of Mass, if there is 8 g of a substance before a physical change, what will be the mass of the substance after the change?
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2. Atoms & Elements
Law of Conservation of Mass
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According to the Law of Conservation of Mass, which of the following is conserved during physical changes?
A
Density
B
Mass
C
Energy
D
Shape
Verified step by step guidance1
Understand the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a closed system during any physical or chemical change.
Recognize that during physical changes (such as changes in shape, state, or density), the substance's mass remains constant even though other properties might change.
Analyze each option: Density can change if volume changes; Energy can be transferred or transformed; Shape can change by deformation, but none of these guarantee mass conservation.
Conclude that the only quantity that remains strictly conserved during physical changes, according to the Law of Conservation of Mass, is mass itself.
Therefore, the correct answer is mass, as it is the property conserved during physical changes.
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