Experiment with this drag-and-drop laboratory
"Experiment with chemistry virtually anywhere with goREACT! In this drag-and-drop laboratory, combine elements from the Periodic Table to create chemical reactions and discover the chemistry in the world around you! With goREACT, you can become a virtual chemist. Whether you're a novice or expert, the free play and guided modes make it fun and fascinating."
iPad and Android apps to do the same thing!