The purpose of this assessment probe is to elicit students’ ideas about chemical change. The probe is designed to find out whether students recognize that substances change chemically as a result of a chemical reaction. It is best used with students in grades 5–12 and students should be encouraged to give examples of chemical changes to support their explanation. The probe can be extended by having middle and high school students use the idea of atoms and molecules to explain their thinking. 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.