This demonstration illustrates the importance of enzymes in the human body. Enzymes catalyze many important chemical reactions in the body. This demonstration is a visual example of how the enzyme catalase, which is present in all cells, but in highest concentrations in the liver, breaks down hydrogen peroxide into water and oxygen gas. Hydrogen peroxide, which is a potentially damaging oxidizing agent, is a by-product of certain cellular reactions. It must be broken down quickly because it could damage and destroy cells.
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Categories: Lab/Student Activity, Teacher Demonstration
This demonstration illustrates the presence and importance of chemistry in everyday objects, including our food. It is an interesting way to start the discussion of acids and bases or to connect... read more
Teacher Demo: The Nose vs. the Wrecking Ball
Categories: Teacher Demonstration
A pendulum is constructed from a 1.0-kg mass suspended from the ceiling, with a length of strong string long enough so that, when pulled about 40o from the vertical, the mass comes to nose level. The... read more
Teacher Demo: An Eggciting Demonstration!
Categories: Teacher Demonstration
This demonstration is a dramatic look at the influence of the atmospheric pressure and the relationship of pressure and temperature of a gas. A burning piece of paper is inserted in a bottle and an... read more