Question

Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.

Which statement best describes these three components of air?
They are all classified as pure substances.
They cannot react with another substance.
They are chemically bonded to one another.
They can be classified as elements
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Answer 1

The correct option is A) they are all classified as pure substances.

Step-by-step explanation:

Pure air is a term which is used to described air which is free from pollutants or other contaminants. All the substance from which air is made are considered as pure substances. Hence, option A is correct.

Other options, like option C, is false because the components of the air are no chemically bonded to one another. They exist freely. Options D is false because not all the components of air can be classified as an element. For example, carbon dioxide is not an element.