This activity introduces students to the concept of reduction–oxidation (redox) reactions. To help students obtain a thorough understanding of redox reactions, the concept is explored at three levels: macroscopic, submicroscopic, and symbolic. In this activity, students perform hands-on investigations of the three levels as they work at different stations that support examination and discovery of the general ideas in redox reactions, including oxidizing and reducing agents, and the stoichiometry of a reaction.