Multiple Choice
Which of the following is a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which type of mixture best describes air?
A
Heterogeneous mixture
B
Homogeneous mixture
C
Element
D
Compound
Verified step by step guidance1
Understand the definitions: A heterogeneous mixture has visibly different components or phases, while a homogeneous mixture has a uniform composition throughout.
Recall that air is composed of various gases like nitrogen, oxygen, carbon dioxide, and others, all mixed uniformly at the molecular level.
Since the gases in air are evenly distributed and you cannot distinguish separate parts by the naked eye, air is considered a homogeneous mixture.
Differentiate this from an element, which consists of only one type of atom, and a compound, which is a substance formed by chemically bonded atoms.
Conclude that air fits the description of a homogeneous mixture because it is a uniform physical blend of multiple gases without chemical bonding.
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