<span>The best reason I can think of for why we believe that air is a mixture is that freezing air slowly yields different liquids at different temperatures. Liquid nitrogen has a different boiling point than liquid oxygen. They also freeze at different temperatures. If air were only 1 compound, then air in its entirety would have a single boiling point and a single freezing point. </span>
Answer:
a mixture in which the composition is uniform throughout the mixture.
Explanation:
Mass over volume
200 over100
2
D only..
A is pure compound
B is mixture of compound and element
C is mixture of compounds
D is mixture of elements
The elements on the periodic table are arranged in order, by increasing atomic number.<span />
