Do it again! This is what your students will say once they have seen the key concepts of a double replacement reaction. Water soluble paper "bonds" hold the starting molecules together. When the molecules are placed in water, the bonds break and "ionization" occurs. Some of the ions bond (magnetic attractions), and form insoluble molecules that precipitate (sink) to the bottom of the beaker. Other "soluble" ions (nonmagnetic) continue to float around in solution. A very powerful visual analogy for a common chemical reaction that you will want to include in your arsenal of demonstrations. Kit includes enough materials to conduct the demonstration at least seven times.
Concepts: Double replacement reactions, solubility.
Time Required: 15 minutes
Materials Provided: Marbles, magnetic marbles, and cellulose paper.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 400
Flinn Middle School Catalog/Reference Manual Page 389
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