Summer is soon slipping away, but we’ve got time for one more fun summer science experiment. It’s time for Sidewalk (or driveway) Chalk!
With only a couple of low-cost items, kids can experiment to make the best recipe for Sidewalk Chalk.
Here’s what you need:
- Plaster of Paris (powder)
- Paper Cups (the waxy ones)
- Craft sticks or plastic spoons (for stirring)
- Tempera Paint or Food Coloring
Mix the Plaster of Paris with water and one (or more) paint/food colors. Be sure to document how much plaster and water is being added so you can generate the perfect sidewalk chalk. Work quickly because the plaster will dry fast in this summer heat. Pour each “recipe” into a separate cup and let sit. Once dry, peel away the waxy paper cup to reveal the stick of chalk and try it out! Which recipe works the best? How does using the paint/food coloring affect your recipe? What could you add to improve the recipe?
And…don’t forget you could win a water testing kit for your classroom. Connect with me on social media and let me know how you’d use this kit in your classroom and I’ll pick the best idea. Help me out by tagging @em_slagle and @starfishedu to make sure I see it.
Lane specializes in STEM education, curriculum design and professional development and makes teachers’ lives easier through innovative, standards-based STEM lessons.