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Mixing Jello ~ Science Sunday

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Science Sunday

Super simple experiment this week, but a great way to talk about molecules and demonstrate how they make a difference in water. :)

Question of the Week…What will happen to jello/gelatin when it’s added to hot water versus cold water?

Items we used for this experiment:

~ hot water

~ cold water

~ 2 cups

~ jello

Predictions and Experiment…

Each of the kids made a prediction about what would happen to the jello when a pinch of it was added to hot water and a pinch of it was added to a cup of cold water. Would it float on the top of the water, solidify, or mix with the water?

The Experiment…

First we poured a bit of the jello pack into the cup of cold water to see what would happen to that. Fairly uneventful.


Once we had recorded our answers to the cold jello trial, we poured a bit of the jello pack into the cup with hot water and watched. The jello began mixing with the water right away and dissolving.

{and of course the questions began on could we now smell the jello water, drink the jello, or eat the jello…sigh}.

The Nutshell Reason…

Water molecules in water vibrate, and hot water molecules vibrate faster than those in cold water because they have more energy. When we put the jello into the hot water, the jello dissolved more quickly because the vibration of the water molecules was greater ~ it spread out more quickly and dissolved.

How to Do Science Experiments with Children Resource: How to Do Science Experiments with Children is available from Amazon and you can also check it out {and do some of the experiments} using Google Docs! The experiments use easy-to-find objects and also include record sheets for kids to fill out with their predictions and experiment results. Each experiment also includes teaching tips and explanations…which are rather handy! :)

Don’t forget to check out some other great science ideas at Science Sunday hosted by Ticia at Adventures in Mommydom.

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This post may contain affiliate or advertiser links. Read my full disclosure policy .

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  1. Crystal says

    I am so going to do this one next week! Great project

  2. oh good one – we did the soft egg in vinegar (I bet jello smelled so much better than that)!!

  3. Beverly Clark says

    ~*Love It*~… and simple! Thanks

  4. books4learning says

    Great experiment. I never thought about why Jello dissolved in hot and not cold. I love how you used an common experience to teach science.

  5. Katie Harvey says

    I dropped by to let you know that your blog has been awarded the Versatile Blogger Award. Congrats! Follow this link to know what you need to do next.


  6. OH my the questions you can get……. They can drive you NUTS!

  7. Fun idea! I never knew the science behind this.

  8. Thanks! Great timing…I had a half-spilled pack of jello on the counter that I didn’t know what to do with! The kids loved it. I have a 2 and 4 year old, so we kept it basic. We talked about how the more jello we added, the darker it got. Also how the more we added, the more “fruity” it tasted. They loved it!

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