Explore dynamic equilibrium and Le Chatelier’s principle through animated particles, live reaction rates and graphs. Students investigate how reversible reactions reach equilibrium, discovering why equal forward and reverse rates do not require equal amounts of reactants and products. Change concentration, pressure, temperature or the presence of a catalyst, then observe how the mixture responds. Four reaction examples connect a simple reversible model to gas equilibria and the Haber process. Prediction prompts, reference markers and separate amount, concentration and rate graphs help students explain their observations. Includes six knowledge checks with feedback and a built-in teacher guide. simopsis