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: Lab/Student Activity, Teacher Demonstration
In this demo, a polyethylene strip is charged by rubbing with wool. The strip is then used to test what happens to the flow of charge when the strip is placed in contact with a conductor (iron nail)... read more
Categories: Lab/Student Activity, Teacher Demonstration
This student activity illustrates how plants grow away from or towards a stimulus by continuing cell growth and elongation on one side of the stem while ceasing cell growth and elongation on the... read more
Categories: Teacher Demonstration
Osmosis is the process by which the concentrations of two solutions equalize across a selectively permeable membrane. Osmosis is necessary for the digestive and excretory systems to function. This... read more