Groundhog Day STEM Project

Materials

• Plastic soda bottle

• Balloon

• Sharpie marker

• Vinegar

• Baking soda

• Funnel

• Flashlight

• Chip clip

Directions

1. Set up a space near a wall (you’ll be so aiming the light at your bottle to create shadows, the light is your sun)

2. Clean and rinse your bottle and remove any labels

3. Blow up the balloons and clamp the end with a chip clip so the air doesn’t escape. Use your marker to draw a groundhog face on the balloon

4. Once you’re done decorating your balloons, let it deflate and set it near the bottle

5. Add 1/4 cup of vinegar to the bottle

6. Use a funnel to add 1/4 tsp baking soda to the balloon

7. Carefully slip the balloon over the top of the bottle. Don’t let any of the baking soda fall into the bottle yet

8. Once you’re ready, flip your balloon and shake it so the baking soda falls into the bottle and triggers the reaction

adapted from Steam Powered Family