About the LessonDensity is a characteristic property of matter. Students will learn that while mass and density are related; the volume of the material must also be considered. This Lesson Guide allows you to preview the variety of activities provided for this module as well as give a suggested flow (lesson plan) of the lesson. The Lesson Guide is a PublishViewTM document (.tnsp). The States_of_Matter_Assess.tns file contains questions associated with this module, but may contain additional related materials not specifically covered in this module. This file is provided in Exam mode. If you wish to use them as a self-check or review, this property can be changed under Question Properties in the TI-Nspire Teacher software prior to providing the file to students.