Audience: Students; Grades: 4-5; Subject: Science. (2005) Describes the process of chemical reactions and explains how they occur. Presents examples of different types of reactions that include decomposition, synthesis and replacement reactions. Identifies the physical, chemical and temperature changes that take place and how this is represented by chemical equations. Also discusses balancing chemical reactions, the law of conservation of mass, and reaction rates. Program concludes with a ten-question video quiz.