Students investigate how the properties of bar soap change when various household chemicals are added. Science and Technology Standards Abilities of Technological Design Students implement a proposed design. Students evaluate completed technological products. They compare the appearance and feel of several soaps.
Students describe results from the product evaluation stage of the technological design process.
Physical Science Standards Properties and Changes of Properties in Matter, Grades 5-8 Substances have different characteristic properties. The types of substances included in a mixture play an important role in determining the properties of the final mixture. Transfer of Energy, Grades 5-8 Heat moves in predictable ways, flowing from warmer objects to cooler ones. While not the main point of this activity, students do witness the phenomenon when the grated bar soap melts from the heat of the burner or hot plate. An example of this phenomenon is the movement of heat from warmer to cooler objects, such as the movement of heat from a burner to a pan to grated bar soap.