Elementary school science teachers may want to check out Inquiry in Action, a free resource provided by the American Chemical Society. Here, readers will find a collection of fully developed lesson plans on chemistry-related topics that are "based on phenomena students observe and explore through hands-on investigations." As of this write-up, the collection includes lesson plans for kindergarten, second grade, and fifth grade classes, with materials organized into thematic chapters. For example, kindergarteners have six lessons on weather-related phenomena, while the chapters for second grade introduce students to the concept of properties of matter, such as dissolving or floating and sinking. The lessons present the concepts "in a 5-E format (Engage, Explore, Explain, Evaluate, and Extend)." Each lesson plan includes background sheets for teachers, and many lessons for higher grade levels also include student activity sheets and student readings. All of the Inquiry in Action lessons are aligned with Next Generation Science Standards, and their materials can be downloaded for free as PDFs at the link above.