This demonstration uses food and a series of containers and additives to model the process of mechanical and chemical digestion in the human (mammalian) digestive system. The demonstration begins with actual food items and ends with a paste closely resembling fecal matter. Due to the high “gross” factor, this demo is a hit with students and is guaranteed to be very memorable.
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Teacher Demo/Student Activity: Disappearing Volume
Categories: Lab/Student Activity, Teacher Demonstration
In this activity, student mix a given quantity of salt with a fixed volume of water. Mass and volume measurements are made before and after mixing to determine if these quantities change. Students... read more
Student Activity: Counting Atoms and Molecules
Categories: Lab/Student Activity, Teacher Demonstration
Chemists are constantly faced with the daunting task of counting large numbers of items, specifically atoms, ions, molecules and compounds. This task is made even more difficult by the fact that not... read more
Teacher Demo: Lung in a Bottle
Categories: Teacher Demonstration
This is a simple, yet extremely effective model of human lungs. Students are able visualize how the lungs, thoracic cavity and diaphragm work together to facilitate inhalation and exhalation. This... read more