Source: Lessons in Matter and Energy
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Lessons in Matter and Energy, from WOSU Public Media, is a series of eight learning modules that demonstrate physical science concepts and phenomena. The series captures some of the most engaging demonstrations presented at the Center of Science and Industry (COSI) in Columbus. The demonstrations clarify essential properties of matter and the nature and transfer of energy. Accompanying each module is a Teacher’s Guide, on video, and a set of assessment tools which include suggested tasks to test comprehension, a scoring rubric and a student booklet. Lessons in Matter and Energy is intended to complement curricular resources in grades 4 to 8.
Teacher's Guide Video (Video)
Assessment (Document)
Student Booklet (Document)
Breathing Blue
A physical change does not alter the chemical makeup of matter. A chemical change does alter the chemical makeup of the original substance. In the human body, when food is digested, a chemical change occurs. Energy and materials needed by the body are produced along with waste products. Carbon dioxide is one of those waste products. When a person exhales, the carbon dioxide is removed from the body through the breath. If we exhale into a straw or glass of water, the carbon dioxide goes into the water.
In this demonstration of chemical change, the presenter blows breath into a methylene blue solution releasing carbon dioxide into the liquid. Carbon dioxide acidifies the water changing the liquid from a bright blue color to green.
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