Question

false: \all mixtures are physically separable.\ defend your answer with an example or counterexample.

Explanation:

Some mixtures form homogeneous solutions at a molecular - level where separation by physical means is extremely difficult. For example, in an alloy like steel (a mixture of iron and carbon), the carbon atoms are interspersed at the atomic level within the iron lattice, making it hard to separate them by simple physical methods.

Answer:

The statement "All mixtures are physically separable" is false. An example is steel, an alloy which is a mixture of iron and carbon, and it is difficult to separate carbon from iron in steel by simple physical means.