Multiple Choice
What percentage of Earth's water is salt water?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following best explains whether a compound is considered a pure substance?
A
Yes, because compounds are always homogeneous mixtures.
B
No, because compounds are mixtures of different substances.
C
No, because a compound is made up of two or more elements and can be separated physically.
D
Yes, because a compound has a fixed composition and distinct chemical properties.
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a fixed composition and distinct chemical properties throughout the sample.
Recall that a compound is a substance formed when two or more elements chemically combine in a fixed ratio, resulting in a material with uniform properties.
Recognize that compounds are not mixtures; mixtures can be separated physically, but compounds require chemical methods to separate into elements.
Note that compounds are homogeneous because their composition is consistent throughout, unlike mixtures which can be heterogeneous or homogeneous.
Conclude that a compound qualifies as a pure substance because it has a fixed composition and unique chemical properties, distinguishing it from mixtures.
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