Question

which of these mixtures are heterogeneous?
granite
brass
salt and water
oil and water

Answer 1

I will said granite and oil and water. Salt and water depends of the amount of salt and water and depends of the kind of salt, if the solution is saturated or over saturated you will have insoluble salt and will be heterogeneous too.

Answer 2

If there can be more than one answer, granite and oil and water. If there can only be one answer then its oil and water.

Answer 3

Granite it is heterogeneous mix http://t.answers.com/answers/#!/entry/is-granite-a-heterogeneous-or-homogeneous-mixture,505a4cbf444f67894766b3e6/2