I put together a simple sheet of directions with four diagrams, which are a main part of the activity. After reviewing what each student should do, they collected their materials, and began. Here's what happened:
|You can see the candies starting to dissolve some of their color.|
After another 5 minutes, it begins to look like this...and eventually the petri dish was a mass of color.
|We finished our worksheet and put it in our notebooks.|
I really like this activity for several reasons:
First, it's really inexpensive! Less than a whole box of Gobstoppers served both of my classes. I had eight petri dishes and we used the bottom half, but we could have used the top half if we'd needed to.
Second, the directions and diagrams were simple to create. Third, it was easy to see whether students could follow "lab" procedures correctly and follow directions correctly.
Give it a try and let me know how it works!