VSEPR Chemistry Invaders vs V

VSEPR invaders in an arcade-style shooter app that helps students learn the various molecular geometries as a result of electron repulsion. First, users learn various different VSEPR configurations. These include: Linear, Trigonal Planar, Tetrahedral, Trigonal Bipyramidal, and Octahedral. Next, the user starts the game and has a certain amount of time to shoot as many geometry models as possible. Each ten-second segment of the game selects a certain molecular geometry and the student must target these models in order to score five points. If the user shoots the incorrect model during the ten second period, they lose 1 point. Once, the timer has reached ninety seconds, the game stops and the user's score is reported. This app provides a fun and interactive experience to help learn molecular geometry in an innovative and new manner. The free version of the app features games that last 1 to 2 minutes and the In-App purchase provides extended game length from 3 to 8 minutes.

Build and observe to come true with figures of repulsion, geometry, angles. V-SPER, free application, is a support for the teaching of the VSPER theory (Valence Shell Electron Pair Repulsion). This theory makes it possible to predict the geometry of molecules from the sole electrostatic repulsion of valence electron pairs. It is based on the Lewis model of distribution of the valence electrons of the atoms concerned. The latter is a prerequisite to take full advantage of V-SPER. The molecule is denoted AXnEm. The atoms (or portions of molecules) linked to the central atom A are denoted X (n: number of X, whether they are linked by single or multiple bonds). The non-bonding electron pairs belonging to the central atom A and not being involved in bonds are denoted E (m: number of E). V-SPER allows to build simple and 3D objects (molecules) and to display the repulsion figure in blue (FigREP), the molecular geometry in yellow (Geom) as well as the angles. Some angles are just modeled and do not always correspond to experimentally measured angles, such as the relative lengths of single or multiple bonds