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Which of the following correctly describes a physical property that distinguishes solids, liquids, and gases from each other?
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1. Intro to General Chemistry
Physical Properties
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Which of the following physical properties could be used to identify a pure substance?
A
Volume
B
Mass
C
Shape
D
Melting point
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Understand that physical properties are characteristics of a substance that can be observed or measured without changing its chemical identity.
Recognize that volume, mass, and shape are physical properties but they depend on the amount of substance or the container, so they are not unique identifiers of a pure substance.
Learn that melting point is a physical property that is characteristic and unique for a pure substance because it occurs at a specific temperature under given pressure.
Therefore, melting point can be used to identify a pure substance since impurities usually alter the melting point, making it a reliable indicator.
Conclude that among the options given, melting point is the physical property best suited for identifying a pure substance.
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