Which of the following homogeneous and which are heterogeneous? Blood, carbon dioxide,Rock, steak,iron, concrete, air,oxygen, salt, milk.

2 answers

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.
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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