Mixing and making a change engages children in learning chemistry long before they are able to understand the atomic structure of materials. This chapter focuses on activities of mixing materials in the kitchen to help children understand the difference between cooking activities and those you do as part of a science inquiry. Chapters 1 and 2 are also included in this book selection. Chapter 1 focuses on science inquiry and the use of “The Early Years” column to support science and engineering learning. Chapter 2 focuses on assessment and the value of assessing children’s learning to understand how to make teaching more effective. It has an example of an assessment tool showing sequences of children’s science behavior in early childhood, with related scientific and engineering practices. A materials list, teacher background information, references, assessment, and outcomes are provided. Also included in the book selection are the Table of Contents, Acknowledgments, Introduction, A Word About Safety, and Index.