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Which of the following substances is classified as a mixture?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following statements about air is correct?
A
Air is matter because it has mass and occupies space.
B
Air is not matter because it is invisible.
C
Air is a pure substance.
D
Air is energy, not matter.
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Recall the definition of matter: Matter is anything that has mass and occupies space.
Consider air: Although it is invisible, air has mass and takes up space, which means it fits the definition of matter.
Evaluate the other options: Air is not a pure substance because it is a mixture of gases (mainly nitrogen, oxygen, and small amounts of other gases).
Understand that air is not energy; energy is a property or ability to do work, while air is a physical substance.
Conclude that the correct statement is that air is matter because it has mass and occupies space.
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