Answer
a) solution
b) suspension
Work Step by Step
a) A mixture that cannot be separated by a semipermeable membrane is a solution because solutions are homogeneous mixtures that contain small particles that are able to pass through both filters and semipermeable membranes.
b) Solvents are mixtures in which solute particles are too large and too heavy to move through filters and semipermeable membranes. As such, a mixture that settles out upon standing is one that will be retained by a membrane and is therefore a suspension.
