Multiple Choice
Which of the following items is a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is an example of a pure compound?
A
Air
B
Iron (Fe)
C
NaCl
D
Sand and salt mixture
Verified step by step guidance1
Understand the definition of a pure compound: a substance composed of two or more elements chemically combined in a fixed ratio, with uniform properties throughout.
Analyze each option: Air is a mixture of gases, not chemically combined, so it is not a pure compound.
Iron (Fe) is a pure element, not a compound, so it does not qualify as a pure compound.
NaCl (sodium chloride) is composed of sodium and chlorine atoms chemically bonded in a fixed ratio, making it a pure compound.
Sand and salt mixture is a physical mixture of two substances, not chemically combined, so it is not a pure compound.
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