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Lesson Objective
The student will learn about chemical change by mixing ingredients to create "Blobber" - a substance similar to silly putty.
Background Information for Teacher
Words in bold are said aloud by the teacher.
Student Prior Knowledge
One tablespoon white glue
½ teaspoon borax
½ cup water
Food coloring (Optional)
Two paper cups
Tablespoons, teaspoons, and stirring sticks
Scales to measure weight
What Can My Blobber Do? (Step 3)
Step-by-Step Guided Lesson
Step 1: Start Video
(Tips: Interact with the video by pausing, to ask questions or discuss information viewed with student.)
Step 2: Teach Lesson
White glue is made up of millions of polymers. When polymers are dissolved like they are in glue they slide around each
other letting the glue flow. However, they are so long, that when they flow they get in each other's way making the glue
more viscous. Viscous means that glue flows more slowly than water.
When you add a borax solution to the glue the polymers change. The borax makes them cross link or connect to each other
like a net. The more tangled the polymers get the more water they trap creating a jelly like feel.
Tangled molecules change and are even more difficult to pour. This makes the solution even more viscous than glue. The
change that takes place to the polymers by adding the borax solution is a chemical change.
Indicators of a chemical change are color, a new odor, light or change in heat. When making Blubber two liquids are mixed
together forming a precipitate. A precipitate is also an indication that a chemical change has taken place.
Weigh all ingredients before mixing together.
Dissolve the borax in water. Pour the white glue into another cup (optional: food coloring). Add one tablespoon of the borax solution
to the glue and stir with a stick or spoon.
Take the mixture out of the cup and knead it with your hands for several minutes. You’ve got Blubber.
Ask the student:
What happens when you mix glue, and a mixture of borax and water together? Can you bend it, bounce it, even blow it up like a
balloon. Why is it so moldable and flexible?
Complete the What Can My Blobber Do
Step 3: Complete the worksheet attached below.
Worksheets needed to complete the lesson
Instructional video of the experiment
(Please follow the recipe on the lesson not the one provided on the video. This video is only to be used if needed as a guide).
Step 4: Start the next lesson with the game or activity attached below for review so the student can
demonstrate understanding of this lesson before moving forward.
Have the student conduct three different Blobber tests using different recipes
varying the amount of borax.
Have the student complete worksheet Comparing Different Recipes
. Predict, gather data about the Blobber, and draw
conclusions as to what happened when the borax amount is changed in each recipe and which recipe is the best.