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There is probably a lesson out there on this but right now, I can't find it in my files.
I have a lab set up where there is vinegar, baking soda, a clear water bottle, a graduated cylinder, a teaspoon, and a balloon.
My opening question is, "Can anyone inflate this balloon without using their mouth to force air into it?
This also helps me to assess what the 5th graders may or may not know about chemical reactions.
Before students can use any of the materials, they have to discuss and design a plan that I must approve. Once, I give them the ok, they can begin implementing their plan. (You can choose to have more materials available but my intent was to focus on states of matter not chemical reactions in this lab. However, it is a great experience they can recall when we do get to chemical and physical reactions.)
So the obvious steps are to put about 1/4 cup of vinegar in the water bottle, hold the mouth of the balloon open and use a funnel to put 1 teaspoon of baking soda inside, the place the mouth of the balloon over the lip of the water bottle without dumping the contents at first. The baking soda is a solid, the vinegar is a liquid, the air in the bottle is a gas right? Countdown 3,2,1 and dump the balloon contents into the bottle and the chemical reaction occurs creating a gas which inflates the balloon. It's a fast and fun lab.
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