Asked by Emmanuel

Which of the following homogeneous and which are heterogeneous? Blood, carbon dioxide,Rock, steak,iron, concrete, air,oxygen, salt, milk.
Answered by Anonymous
Some of those are elements in the periodic table or chemical compounds such as NaCl or Fe. Others are combinations of different materials. For example a rock may have several types of mineral in it. Now you try to figure out which is which.
Answered by bobpursley
blood can be filtered, or centifruged, separating its components.

Concrete is not a heterogenous mixture: look at the pebbles in it.

Milk has fat that floats to the top.
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