This app provides science and chemistry students a chance to study, learn and practice recall of four important diagrams. The diagrams included are an Electrochemical Cell, Heating Curve, Reaction Potential Energy Diagram, and an Electrolytic Cell. Users may study the diagrams and then practice recall by identifying the labels on the diagrams. This app is appropriate for High School and College students. A timer is provided as a means of testing the efficiency of the activity. Students should practice to acquire the fastest time possible. This program is provided free of charge to all. It is not to be sold or distributed for profit. It has been tried on a Galaxy S8+ phone, a Kindle Fire HD tablet and a Samsung Tab-S2 tablet. It should run fine on Android versions 4.0 through 8.1 Contact the author at rtcarman47@gmail.com with questions and comments. Other apps by the author can be found on Google Play Store by searching for “rtcgames”.