Need some help on this problem. I think I know the answer, but I'm not confident.

Question

A student had a sample of a heterogeneous mixture containing only two components. The student wanted to separate the components and the student knew that one of the components was soluble in HCl and the other component was not soluble in HCl. When the student added the HCl, one component dissolved and the other did not… as expected. This allowed the student to separate the two components. This would be an example of a ______ separation method.

Group of answer choices

Physical

Chemical

Subatomic

Thermal

Answer 1

Physical. If the mixture is heterogenous… it would be most easily filtered with vacuum filtering.