Multiple Choice
Which statement best describes the relationship between elements and compounds?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is classified as a pure substance?
A
Gasoline
B
Soda
C
Water from a lake
D
Salt (NaCl)
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a fixed composition and distinct chemical properties. It can be either an element or a compound, but not a mixture.
Analyze each option given: Gasoline is a mixture of hydrocarbons, so it is not a pure substance.
Soda is a mixture of water, dissolved gases, sugars, and other additives, so it is not a pure substance.
Water from a lake contains various dissolved minerals and impurities, making it a mixture rather than a pure substance.
Salt (NaCl) is a chemical compound with a fixed composition and uniform properties, so it is classified as a pure substance.
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