Interpretation: The correct description that identifies air as a compound, element, the heterogenous or homogenous mixture should be determined.
Concept Introduction: The simplest form of matter consisting unique set of properties is said to be elements. They are pure substances made up of only one type of atom.
The chemical combination of two or more elements in a fixed proportion results in the formation of a compound.
A mixture is said to be homogenous when its composition is uniform throughout whereas a mixture is said to be heterogenous when its composition is not uniform throughout.

Answer to Problem 6STP
Homogeneous mixture.
Explanation of Solution
The air is made up of various elemental gases, mostly N2 and O2, as well as trace amounts of inert gas elements. The composition of various gases in air is uniform throughout so it is said to be a homogeneous mixture of several gases.
Chapter 2 Solutions
EP CHEMISTRY-ETEXT ACCESS
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