In this experiment, learners will conduct chemical and physical tests to identify mystery substances. This experiment is very flexible, allowing educators to determine the number of unknowns to analyze and tests to conduct, as well as the depth of inquiry based on the time they have at their disposal. The activity is a simplified version of "qualitative analysis," a technique used by scientists to identify unknown substances using concepts such as conductivity and solubility. Background questions and explanations are included, as is an extension game.