and it needs to last about 30 minutes
All i have so far are:
- Fill up a balloon with water. Put a lighter under it and watch it not pop
- Baking soda + vinegar (but i feel like that was only impressive in 2nd grade)
- Fill a glass with water, put a piece of paper on top and flip it over
Any ideas guys?
***Update****
I gotta say things went pretty well. The kids were really impressed. Thanks to all for the great suggestions, especially to 5to1baby1in5 for the Bill Nye website.
In my half hour slot I did the following experiments:
1. I had cut up a bunch of 'flowers' with four petals out of regular paper. I told the kids to fold each of the petals into the middle. Then they put the flower on its back on the water and they saw the petals open.
2. I blew up two balloons, one with water and one with air. I held a lighter under each, and lo and behold, the one with water didnt pop. Just to spice things up, I made one of the girls stand under the balloon with water as i held a lighter to it.
3. I showed them that a pebble and a large rock will fall at the same rate, even when thrown from a height of 20 ft.
4. I made them use the surface tension in a cup of water to make a paperclip float. Those that were successful got the bonus of me putting a few drops of soap in the cup and watching the paperclip immediately fall to the bottom.
5. And as my finale, Mentos + Diet Coke (8 mentos pieces)
All i have so far are:
- Fill up a balloon with water. Put a lighter under it and watch it not pop
- Baking soda + vinegar (but i feel like that was only impressive in 2nd grade)
- Fill a glass with water, put a piece of paper on top and flip it over
Any ideas guys?
***Update****
I gotta say things went pretty well. The kids were really impressed. Thanks to all for the great suggestions, especially to 5to1baby1in5 for the Bill Nye website.
In my half hour slot I did the following experiments:
1. I had cut up a bunch of 'flowers' with four petals out of regular paper. I told the kids to fold each of the petals into the middle. Then they put the flower on its back on the water and they saw the petals open.
2. I blew up two balloons, one with water and one with air. I held a lighter under each, and lo and behold, the one with water didnt pop. Just to spice things up, I made one of the girls stand under the balloon with water as i held a lighter to it.
3. I showed them that a pebble and a large rock will fall at the same rate, even when thrown from a height of 20 ft.
4. I made them use the surface tension in a cup of water to make a paperclip float. Those that were successful got the bonus of me putting a few drops of soap in the cup and watching the paperclip immediately fall to the bottom.
5. And as my finale, Mentos + Diet Coke (8 mentos pieces)