[jooliahh]

Which of the following is an element, a compound, a heterogeneous mixture or a homogeneous mixture?

Carbon dioxide
Brass
Oxygen
Salt water
Magnesium
Cement
Water
Salad

D:

[Credendovidis]

Which of the following is an element, a compound, a heterogeneous mixture or a homogeneous mixture?

carbon dioxide
brass
oxygen
salt water
magnesium
cement
water
salad

Look, it is not the idea that we do YOUR homework...
So start using your own grey cells by grounding down each item in your list into it's basic contents :

Ask yourself for each of the following : is there more than one single element here ? If more than one element, what is the other, is it a molecule or a mixture (and what type of mixture)...

carbon oxide =
brass =
oxygen =
salt water =
magnesium =
cement =
water =
salad =

Success !

:)