Moving Beyond 2D Covalent Bonding

This three-lesson sequence is from a Bonding unit in a sophomore High School Chemistry class that focuses on the formation of covalent bonds in simple molecules. The purpose of these lessons is for students to apply their knowledge of atomic structure and electron arrangements, and understand, at an atomic level, why non-metal atoms share pairs of electrons to achieve electronic stability. Learning objectives are formatively assessed throughout the lessons, focused on addressing student misconceptions. This is done through drawing diagrams and simple 2D models, teacher-led question/answer and discussion, and an in-class worksheet. For this three-lesson sequence, eight 3D experiences were created to support the visualization of the covalent bond formation and minimize students’ misconceptions. This paper focuses on two 3D experiences, water and carbon dioxide.