(#12) Solutions
This unit begins with corn starch. Mixed cold, it forms a coarse suspension that clears by filtering or settling. When boiled it forms both a cloudy colloidal suspension and clear true solution. Concepts and vocabulary learned here are then applied to a series of tasks that clean muddy water. Alum coagulates the clay, chlorination bleaches all traces of food coloring, but only distillation makes it pure. Students then use rock salt, baking soda, Epsom salt and copper sulfate to study about crystals, concentration and saturation, plus variables that influence rates of dissolving and limits of solubility.
(#12) SOLUTIONS is part of our Self-Directing Task Card Series. It is a 72 page soft-bound book organized into three main parts:
INTRODUCTION
* A TOPS Model for Effective Science Teaching * Getting Ready * Gathering
Materials * Sequencing Task Cards * Long Range Objectives * Review / Test
Questions
TEACHING NOTES (28 lessons)
* Two Kinds of Filters * Two Ways to Purify * A matter of Size *
Definitions * Clearing Muddy Waters * Coagulation * Purify By Chlorination
* Purify By Distillation * Oil and Water * In Between * Alcohol and Water
* What Kind of Mixture? * Hot and Cold * Particle Size * Saturation * Can
More Dissolve? * Frosted Glass * Basic Shapes * Water Spots * Equilibrium
* Rate of Dissolving (1) * Rate of Dissolving (2) * Water of Hydration (1)
* Hydration (2) * Solubility Variables * Solubility Curves * Negative
Solubility * Supersaturation
REPRODUCIBLE LINE MASTERS
* 28 Open-Ended Task Cards * Cube Pattern * Equilibrium Strip * Graph
Paper
______________________________
(#12) SOLUTIONS requires basic lab equipment: a hot plate, test tubes, 10 mL graduated cylinders, lab balances (or improvised TOPS balances from #05 Weighing , small Pyrex beakers, plus special chemicals for two activities (calcium acetate and sodium thiosulfate). Gather these and other simple materials, photocopy the 28 task cards, and you're ready to explore TOPS Learning Systems hands-on.
GRADE RANGE: 6-10
ORIGINS: written by Ron Marson / illustrated by Peg Marson / copyrighted
in 1990
by TOPS Learning Systems / ISBN 0-941008-82-7
ORDERING: Please print a copy of our order form, which lists all our titles. Use this form (or scratch paper) to track your ordering preferences as you browse our website.
#12 Solutions @ $13.00
#SS108 50 mL Pyrex Beaker @ $3.50
#SS109 10 mL Graduated Cylinder @ $3.50
#SS111 Digital Gram Pocket Scale @ $14.50 (optional)
