Students investigate how atoms combine to form molecules and larger structures, then use that understanding to explain how matter is organized in living things and changes during chemical reactions. Through building, testing, and revising physical or digital models, they make sense of atomic structure, molecule naming, conservation of mass, and the role of molecules in cells and food. The experience builds scientific modeling skills alongside collaboration, critique, communication, and self-reflection as students create models accurate enough to teach others. Their work culminates in a classroom exhibition of revised models supported by peer feedback and clear scientific explanations.

Students will develop and use physical and visual models to show the structure of atoms, including accurate numbers and placement of protons, neutrons, and electrons, and explain how atoms combine to form simple molecules and extended structures. They will apply atomic models to describe how molecules important to life, especially carbon-based molecules, are rearranged in chemical reactions in cells and food systems while conserving matter. Students will strengthen scientific vocabulary and naming skills for atoms and molecules, use peer critique to revise their models for accuracy and clarity, and communicate their understanding through a classroom exhibition and short explanation.

Students will create a sequence of products: atom sketches, labeled practice models showing protons, neutrons, and electrons, molecule-building drafts, and short explanation cards that connect atomic structure to molecules of life such as water, glucose, and carbon dioxide. In teams, they will develop a final 3D or digital model set that includes at least one atom, one simple molecule, and one extended structure, with accurate particle counts, labels, and a brief explanation of how atoms are rearranged in chemical reactions while mass is conserved. Students will also produce peer feedback notes and revision checklists during critique sessions. For the exhibition, each team will display its final models with a gallery card or short recorded presentation explaining how the models help answer the essential question.

Begin with a “mystery meal” launch: show students a familiar food item and ask, “What is this made of if we keep zooming in?” then let teams examine images or simple samples of food, water, and carbon dioxide and sort them by atom, molecule, or living structure. Follow with a quick model challenge in which groups use beads, clay, or paper pieces to build what they think an atom and a simple molecule look like, then do a gallery walk to notice patterns, questions, and misconceptions. Close by introducing the driving question and explaining that students will create accurate models that show protons, neutrons, and electrons and connect those models to the molecules of life.

Host a classroom “Molecules of Life Museum” where teams display labeled 3D atom, molecule, and cell-related reaction models with short explanation cards that identify protons, neutrons, electrons, molecule names, and how atoms are rearranged in living things. Invite another 7th grade class, families, or school staff to rotate through the exhibits while students give 2-minute presentations and answer questions about mass conservation, simple molecules, and extended structures. Include a peer feedback gallery walk using warm and cool feedback forms so students can reflect on how clearly and accurately their models communicate the science. End with a class showcase wall that features revised models, reflection notes, and photos of each team’s process from first draft to final product.