These questions and more may be raised and then answered when the following activity is performed in your classroom. This activity also introduces students to some key aspects of the retail world. Abilities of Technological Design Students implement a proposed design when each group in the class follows a different recipe to make window cleaner. Students evaluate completed technological products. They develop a method for testing the effectiveness of their window cleaner against commercial brands.
Students describe results from the product evaluation stage of the technological design process.
They discuss the effectiveness of testing criteria for window cleaners. Scientific Inquiry Students use mathematics and graph the test data using a histogram or line graph. Properties and Changes of Properties in Matter, Grades 5-8 Substances have different characteristic properties, including the ability to dissolve other substances. When combined together to make a mixture, the resulting mixture has different properties depending upon the amount of each substance included. The ammonia in window cleaner reacts with triglycerides in grease, producing water-soluble products.