This assessment probe is to elicit students’ ideas about characteristic properties of matter. It is designed to find out if students recognize some properties can be used to identify a substance. The probe is best used with students in grades 6–12, but students need to have an initial concept of the properties of the unknown substances listed in the data analysis table provided. The probe is provided in English and Spanish. A materials list, teacher notes, standards, assessment, and references are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, Dedication, About the Authors, Introduction, and Index.