Question

Which of the following is a heterogeneous mixture
Air
Salt water
Steel
Soil
I think it's soil but I'm not positive

Answer 1

"A heterogeneous mixture is a mixture where the components of the mixture are not uniform or have localized regions with different properties."

"A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture."

Source: http://chemistry.about.com/od/chemistryterminology/a/Heterogeneous-Vs-Homogeneous.htm

In air, all molecules are gaseous and of uniform quality -- no discrete components
In salt water, water and salt are uniformly distributed in aqueous phase -- no discrete components
In steel, carbon and iron are uniformly mixed -- no discrete components
In soil, minerals and organic matter differ in consistency -- many discrete components.

Answer 2

it is soil

Answer 3

Thanks