Lessons in Matter and Energy, from WOSU Public Media, is a series of eight learning modules that demonstrate physical science concepts and phenomena. The ...
Lessons in Matter and Energy
A chemical reaction is a process in which the physical and chemical properties of the original substances change as new substances with different physical and chemical properties are formed. The molecular structure of the substances is altered. The original substances no longer exist and the change is irreversible. Indications of chemical change include changes in color, the production of a gas (bubbles), and/or the production of energy.
This demonstration shows evidence of hydrogen peroxide decomposing into water and oxygen. The oxygen gas causes soap bubbles to come pouring out of the mouth, nose and eyes of a plastic pumpkin head.