How can we get students to “see” the extremely small size of an atom? In this experiment, students measure the mass of the zinc coating on a piece of galvanized iron by reacting the metal with hydrochloric acid. Only the zinc, not the underlying iron, reacts with the acid under these conditions. The volume and thickness of the zinc coating are also determined. Given the diameter of a zinc atom, students can then “count” the number of layers of atoms in the invisible coating. It's a quick and simple experiment, but one that will really help your students build an accurate model of atomic structure. Includes reproducible student handouts, detailed background information, Teacher Notes with sample data and answers to questions, and all necessary chemicals and supplies.
Complete for 30 students working in pairs.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 425
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