Students will launch the chemical-reaction design challenge by examining useful school-safe reaction examples, identifying observable evidence of reactions, and framing an initial school-community problem with measurable criteria, constraints, and needed evidence for later testing.

Students will define a school-based chemical reaction design problem, research safe low-waste reaction options, and produce an evidence-based design brief with measurable criteria, constraints, and an initial CER justification for the concept they want to pursue next.

Students will compare reaction-based design options with evidence, select a team concept using a weighted decision matrix, and build an initial low-waste prototype while documenting how chemical reaction evidence, safety, and waste constraints shape their choices.

Students will test their selected chemical-reaction prototypes with consistent measures, analyze evidence of chemical change and performance, use peer critique to revise both product and team process, and prepare a concise evidence-based showcase story for the final exhibition.

Students will present their tested chemical-reaction solution to an authentic audience, defend design choices with data, gather final feedback on usefulness and safety, and complete a concise reflection on how evidence and critique shaped both the prototype and team process.