Lecture 27 - Matter. By the end of this unit, students should recognize that the observable properties of matter result from atomic-level interactions. They start the unit by reviewing the distinctions between substances and mixtures. Most important, they focus on the concept that mixtures can be separated by physical means, but substances cannot. They learn that each substance has a characteristic set of chemical and physical properties, which leads to the idea that substances differ at the atomic level. | Lecture Science 1 - Associate Degree in Education Lecture 27 - Dr. Arshad Bashir
