We concluded our study of corn with the YK , PK and OK kids this week. Each of them used the terms “solution, dissolve, chemical reaction, conductor, controlled variable and realized the power of bubbles!
I added soap to the PK potion so they could watch it really ooze. They called it wizard’s potion.SCIENCE TALK>>>
The bicarbonate of soda and the vinegar react to release carbon dioxide gas. As the tiny gas bubbles form, they attach to the popcorn. The carbon dioxide is less dense (lighter) than the water, so once there are enough bubbles on the kernel, the bubbles lift the kernel to the surface.
Once the kernel reaches the surface, the bubbles on top of the kernel burst, releasing the carbon dioxide to the air, and the popcorn will turn over. Then, the remaining bubbles on the kernel will burst. Now, the kernel doesn’t have any bubbles holding it up, it sinks back to the bottom. More bubbles attach themselves to the kernel and they rise again, and keep on dancing until the reaction is over!
It was amazing to watch the kids as they finally caught on to the fact that the corn was NOT JUST FLOATING>>it was dancing and there was a specific reason why!