Osmosis, the movement of a solvent (usually water) across a semi-permeable membrane from an area of higher solvent concentration to an area of lower solvent concentration, is key in the maintenance of homeostasis. This demo shows osmosis across a semi-permeable membrane.
This demonstration is an entertaining way to introduce simple chemical reactions and the types of evidence that indicate the occurrence of chemical change, including the production of a gas. A link... read more
Categories: Teacher Demonstration
This is a Thermite reaction that can be done safely indoors. The rust (Fe2O3) reacts with the aluminum foil (Al) to produce aluminum oxide (Al2O3), elemental iron (Fe) and heat. This reaction is a... read more