Question

Is air a homogenous mixture of two or more pure substances?

Answer 1

A homogeneous mixture is one that is uniformly distributed throughout. (not concentrated in one area, like the common example of oil and water (which would be a heterogeneous mixture)). Are the components of air evenly distributed, or are there patches of oxygen and nitrogen molecules, here and there?

Answer 2

They are evenly distributed, making it homogenous. :)

Answer 3

Right ! :)