Are the following homogeneous or heterogenous mixtures?

Question

soil
sugar water
alcohol
pure air

Answer 1

Soil - Heterogeneous
sugar water - Homogenous
alcohol - Homogenous
pure air - Homogenous

HOMOGENEOUS MIXTURE
A homogeneous mixture is defined as "the mixture, which has uniform composition through out its mass".
EXAMPLE:
Air, sugar solution, salt solution, alloys, soft drinks (Pepsi, Coca-Cola etc.)
HETEROGENEOUS MIXTURE
"Mixture that do not have uniform composition through out their
mass are known as heterogeneous mixtures".
EXAMPLE:
Soil, rocks etc.

Answer 2

homogeneous = the same through out
heterogeneous - a mix that is not the same

- Heterogeneous
Soil is a mix of sand, dirt, rock, decaying matter etc.
Air is a mix of various gases; nitrogen, oxygen, carbon dioxide and argon to name a few. It is a mixture. Pure Air isn't pure, it is a mix. If you look at any given sample then you are not going to have the same mixture of gases. If the gases are blended and the mixture is the same then it becomes homogeneous.

- Homogeneous
Sugar is a single substance and when you put into water it can dissolve and become a sucrose solution.
Alcohol is a molecule, but you would only have one molecule in a pure alcohol solution.

The test is to look at the sample under an imaginary microscope and see if it is the same through out. Soil and Pure air are a random mix so it is not the same. A sugar water solution would have the same mixture through out, although if some of the sugar fell out of the solution then it would become heterogeneous. Sea water is heterogeneous because there are more than one kind of salt and in different concentrations mixed into any given sample, along with oxygen, plankton and who knows what else.

Answer 3

soil- heterogenous
sugar water- homogenous
alcohol- homogenous
air- homogenous.

If it is the same chemical makeup regardless where you take a sample from (top or bottom of a container) then it is homogenous.

Answer 4

soil hetero sugar water hetero pure alc. homo air hetero