ODYSSEY VSEPR Theory 與 Model ChemLab for iPad 使用情況與統計
Why are some triatomic molecules linear (carbon dioxide, hydrogen cyanide) and others are bent (water, sulfur dioxide)? And why is the bond angle in water (~105°) smaller than that in sulfur dioxide (~119°)? Valence Shell Electron Pair Repulsion (VSEPR) theory provides surprisingly simple explanations in terms of the electron pairs that surround the central atom of a given molecule. VSEPR theory is described in detail in every introductory chemistry book.
The ODYSSEY VSEPR Theory app provides three-dimensional models of 50 small molecules and ions as well as a set of generic models that illustrate the conceivable geometries of the theory. Each model can be moved and manipulated with simple touch gestures. Bond lengths and bond angles can be queried.
Users can pick from multiple model styles (such as Ball and Spoke or Space Filling), request a schematic display of lone pair positions, and show the molecular dipole arrow. A glossary, comments section, and a set of multiple-choice questions (with randomized options) are also available.
Most learners of chemistry are visually oriented. Complementing the presentation found in any introductory textbook, ODYSSEY VSEPR Theory enables exploration of one of the most fundamental concepts in general chemistry—molecular shape.
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Model ChemLab for iPad is an interactive Chemistry Lab Simulation.
Model ChemLab is ideal for distance learning, hybrid labs, demonstrations, lab run-throughs, pre-lab work, dangerous and environmentally hazardous, expensive, or lengthy labs.
ChemLab comes with a large selection of pre-defined labs simulations including:
Acid/base reactions, bond lab, cations reactions, electrochemistry, equilibrium, flame lab, fractional crystallization, fractional distillation, gas laws, gravimetric analysis, kinetics, nuclear chemistry, redox reactions, stoichiometry, thermal chemistry, volumetric analysis, water quality, weak acid titration and many more...
ChemLab also allows instructors to develop and distribute their own lab simulations, using our Model ChemLab Professional desktop software for MacOS or Windows.
ChemLab includes a large selection of lab equipment, including: beakers, calorimeter, centigram & electronic balances, electrochemical cell, Erlenmeyer flasks, test tubes, gas syringes with pressure gauges, graduated cylinders, burets, pipets, watch glasses, filtering flask with buchner funnel, bunsen burner, hot plate / Magnetic stirrer, stirring rods, distillation equipment setup, calorimeter, conductivity meter, geiger counter, potentiometer, spectrophotometer and more…
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ODYSSEY VSEPR Theory VS. 
Model ChemLab for iPad1月 18, 2025