The chemical bag is free and easy to use. This app is an educational app designed for students and teachers to solve chemistry problems and act as an equation solver. The Chemical Briefcase app does not require internet connection. Chemical bag app is really useful and best app ever on app store. This chemistry bag app contains: 1. Chemical equations balancer 2. Molar mass calculator 3. Atomic groups 4. The periodic table 5. Solubility Features: 1. Balancing chemical reactions and equations