Which is a pure substance? a. air b. nitrogen c. apple juice d. tap water

Explanation:

Because nitrogen is an element, that's is not combined with nothing. The air has molecules of other elements besides oxygen. Apple juice is a mixture a hydrogen, oxygen, and other elements. And tap water, even if is ''purified'' that's a lie, because pure water is not apt to human consumption.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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