Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide. Which statement best describes these three components of air?
Answer
A
Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
B
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
C
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
D
Oxygen, nitrogen, and carbon dioxide can be classified as elements.
Explanation
A pure substance has a fixed composition and can be either an element or a compound. Oxygen and nitrogen are elements, while carbon dioxide is a compound, so each is a pure substance when considered separately. In air, they are mixed together rather than chemically bonded to one another.
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