Robert Gardner 
Atoms and Molecules Experiments Using Ice, Salt, Marbles, and More [PDF ebook] 
One Hour or Less Science Experiments

Do your students wait until the last minute to get started on Science projects? No problem. Each experiment in this resource follows the scientific method, and can be completed in an hour or less. Readers will model a chemical reaction, discover how small a molecule is, and find out what happens when atoms jump from one molecule to another. Most experiments also include ideas for science fair projects in case your readers have extra time.