When it comes to mixtures, size matters! The size of the particles will determine whether a mixture is a solution, colloid, or a suspension. Through a series of four demonstrations, students will see and learn how to easily identify a mixture as one of these three types. Can the particles be collected in a filter? Will they pass through a semipermeable membrane? Do they scatter light? Students will witness these different properties and draw conclusions based on their observations. Teacher Demonstration Notes and reproducible student worksheets are included. Enough materials are included to perform the demonstration seven times.
Concepts: Solution, colloid, semipermeable membrane, Tyndall effect.
Time Required: 20 minutes
Materials Provided: Ammonium hydroxide solution, copper(II) sulfate solution, colloidal starch solution, hydrochloric acid solution, iodine-iodide solution, sodium thiosulfate solution, dialysis tubing and clamps.
Note: Perform this demonstration in a fume hood or well-ventilated lab.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 401
Flinn Middle School Catalog/Reference Manual Page 350
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