Question

AIR

choose the classification below that is most appropriate:

A) pure element

B) pure compound  

C) mixture of elements   

D) mixture of compounds   

E) mixture of both elements and compounds

For the samples that you identified as mixtures (i.e., that you labelled C, D, or E), also indicate whether that mixture is a solution, a suspension, or a heterogeneous mixture.

Also indicate the specific substances and/or types of atoms present in each sample, to the extent possible.

In some cases, two different answers might be reasonable depending upon your assumptions about the sample or the conditions. Wherever you notice such possibilities, explain when each classification might be justified.

Answer 1

Air is a mixture of compounds as it contain mixture of gases like nitrogen, oxygen, carbon dioxide etc. Since these compounds are present in a definite proportion, we say that air is a homogeneous mixture.