Air is a(n)

Question

Air is a(n)

BlackTom AI · Accepted Answer

In this question, we are asked to categorize air among basic chemical and material science options.
Option 1: 'compound.' A compound is a substance formed when two or more elements are chemically bonded in fixed proportions. Air is not a single chemical compound; it is a mixture of several gases (primarily nitrogen, oxygen, argon, carbon dioxide, neon, helium, and others) in varying amounts. Therefore this option is incorrect.
Option 2: 'element.' An element is a pure substance consisting of only one type of atom. Air contains many different elements in the form of molecules and diatomic or polyatomic species; it is not an element itself. Hence this option is incorrect.
Option 3: 'None of the above.' Given that air is indeed a mixture, this statement would be false because there is at least one correct description among the listed choices. Therefore this option is incorrect.
Option 4: 'homogeneous mixture.' A homogeneous mixture has a uniform composition and appearance throughout, and air fits this description because its constituent gases are well mixed at the molecular level without visible separation. This makes air a homogeneous mixture, supporting this option as correct.
Option 5: 'heterogeneous mixture.' A heterogeneous mixture has a non-uniform composition with visibly different parts or phases. Since the components of air are uniformly distributed and not visibly distinct, this option is incorrect.
Thus, after evaluating each choice, the reasoning shows that air is best described as a homogeneous mixture.

SP25: CHEM-30A Sec 01 - Intro Chem Final Exam

Air is a(n)

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