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  • Oobleck!
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2 Comments

  1. This activity was a huge hit in Ms. Tucci's 2nd grade class. One thing we would change is using the straws for putting the water into the bowls of corn starch. This took far too long and we ended up going around adding water to the students' corn starch so that it would speed up the process. It is important not to add too much water, though. If a pair does add too much water, it can be quickly remedied by adding more corn starch. In the end while doing the demonstration with the bouncy ball, the ball actually sank because of the consistency of all the different ooblecks. I would suggest skipping that part if you do this activity. The video of the man running across a pool of oobleck was very entertaining for the class. We felt this was a very successful activity; the kids got messy and they learned about the states of matter. Be sure to be clear that the oobleck is both a solid and a liquid, depending how you interact with it. Also, we were considering letting the students add food coloring to their oobleck but there was not enough time, and it seemed like it would have died their hands all different colors which isn't exactly desirable.

  2. In Ms. Hong's fifth grade classroom, we did this experiment in order to teach them about the three different phases (solid, liquid, gas). The kids loved it and thought it was really cool. We introduced the subject by showing them videos of oobleck. We also asked them to think about what makes each phase different and to give these different phases a definition. We used water as an analogy, saying that water could be both solid (ice) and liquid before doing the experiment. It is important that the kids do not add too much water to their cornstarch because then it just becomes watery cornstarch instead of oobleck. The experiment can be a little bit messy but I think that it was pretty successful.