And what happened then...
Well... in Who-ville they say
That the Grinch's small heart
Grew three sizes that day!
from How the Grinch Stole Christmas by Dr. Seuss
Can you picture the scene in your head? The Grinch straining as he holds the sleigh balancing precariously on a mountaintop. He hears the singing and then pop, pop, pop, his heart fills with joy.
I love watching How the Grinch Stole Christmas (the cartoon version, not the live-action movie) every year and I was dying to do an activity based on this favorite movie. So, we took a classic science experiment, gave it a Christmas-sy twist. Then voila! We made the Grinch's heart grow three sizes - or more.
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Empty water bottle
Before you begin your project, you'll want to make the Grinch's small heart. Take a green balloon and use your red Sharpie to draw a simple heart on the balloon. Give it a minute to dry before you begin your project.
Next, add some vinegar to your empty water bottle. I filled it up to about the second groove from the bottom. Eyeball it. You don't need to be exact.
Attach your balloon to the bottom of your funnel. Fill the balloon with about two to three spoonfuls of baking soda. Remove if from the funnel.
Carefully, without dumping any baking soda into your bottle, attach the balloon to the top of the water bottle.
You're all set up! Get ready to grow the Grinch's heart.
Lift the balloon up and shake the baking soda into the bottle. Your balloon will start inflating immediately. You can let go once the balloon starts filling up.
Why did the Grinch's heart grow? The combination of baking soda and vinegar formed a gas called carbon dioxide, which filled your balloon. This is the same gas that forms the bubbles in your favorite carbonated drink.
Have you watched How the Grinch Stole Christmas yet this year? When you do, add a little extra fun with this Christmas science experiment.
You may also enjoy one of these science activities:
Or you can find even more activities by following my Science Play Pinterest board: