Multiple Choice
Which of the following is an example of a mixture?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is classified as a compound?
A
Air
B
O_2
C
NaCl
D
Fe
Verified step by step guidance1
Understand the definition of a compound: A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.
Analyze each option: Air is a mixture of gases, primarily nitrogen and oxygen, not chemically bonded, so it is not a compound.
O_2 (oxygen gas) consists of two atoms of the same element bonded together, so it is a molecule but not a compound.
NaCl (sodium chloride) consists of sodium and chlorine atoms chemically bonded in a fixed ratio, making it a compound.
Fe (iron) is a pure element, not a compound, because it contains only one type of atom.
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