Question

a chemist has dissolved a certain substance in water. the chemist knows that more of the substance could be dissolved into the water before it stops dissolving. therefore, the current solution is unsaturated saturated supersaturated

Explanation:

An unsaturated solution is defined as a solution in which more solute can be dissolved at a given temperature and pressure. Since the chemist knows more of the substance can be dissolved, the solution is unsaturated. A saturated solution can't dissolve more solute, and a supersaturated solution has more solute than it can normally hold (and is unstable, with solute likely to precipitate out, not the case here as more can still dissolve).

Answer:

unsaturated