Is ice water a compound element or mixture?

Ice is neither heterogeneous or homogeneous. It is actually a compound.

Here are the definitions of each:

compound - a chemical combination of two or more different elements; can be broken down into simpler substances by chemical means and has properties different from those of its component elements

(ex. water)

heterogeneous mixture - one that does not have a uniform composition throughout and in which the individual substances remain distinct

(ex. Pizza)

homogeneous mixture - one that has a uniform composition throughout and always has a single phase; also called a solution

(ex. soda)