There are many different kinds of polymers, both natural and synthetic. Polymers are widely used and have many practical applications based on their properties. They are often strong and chemically stable. Examples of natural polymers include proteins, starch, cellulose, DNA, latex rubber and silk. Examples of synthetic polymers include polyester, polyvinylchloride (PVC), polyethylene, and polystyrene.
This demonstration introduces students to two common polymers: polystyrene and starch.
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
Categories: Teacher Demonstration
In this demo, a polyethylene strip is charged by rubbing with wool. The charged strip is then used to make paper circles stand on their edges inside a Petri dish. This demo introduces students to the... read more
Categories: Teacher Demonstration
The distinction between diffusion and osmosis is not clear to many students. Observing coloured particles (such as food dye) diffuse in water shows direct evidence of diffusion, but the movement of... read more