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Just call it the Halloween After-Glow. No, it’s not the warm feeling you get in your heart when you think of all of those darling little Trick-or-Treaters or think of the fun kids had opening their candy. The “After-Glow” refers to the light coming from inside the pumpkin after the kaboom! Hundreds of chemistry teachers from across this great land of ours joined together yesterday to share their favorite Halloween science demonstrations.
VIDEO: Steve’s Exploding Pumpkins
Here’s your next question… How do you do it? Since this is a classic chemistry teacher demonstration, it’s best to consult your favorite chemistry teacher or let your fingers do a little “googling” to research the various ways to produce the small amount of acetylene gas in the pumpkin… or just read through the comments below.
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November 3rd, 2005 at 10:47 am
How can I find out the procedure to produce the exploding pumpkin. My daughter is in 10th grade
in the Animo South Los Angeles High School. I know
she and her friends would love to do this in class
with their science teacher for fun.
November 3rd, 2005 at 11:24 am
Your daughter’s high school chemistry teacher can contact Flinn Scientific to purchase the materials to do the experiment. Only certified chemistry teachers can purchase from Flinn Scientific (because of liability reasons as you might imagine).
The chemical reaction inside the pumpkin produces a small amount of acetylene gas which is ignited. The reaction is dangerous for someone to try unless they have a good chemistry background. The demo has become quite popular among chemistry teachers thanks to Flinn Scientific.
November 3rd, 2005 at 5:12 pm
My son is in 6th grade and came home with an assignment to do a science experiment in front of the class in about a month. Would it be possible for him to do the oozing pumpkin? Is the formula in one of your books? If you don’t think this would be a good choice, do you have any other cool suggestions. BTW, I love you website and the videos. I found it while searching for something for him to do.
December 18th, 2005 at 9:40 pm
I didn’t see your post… sorry! The oozing pumpkin uses very strong hydrogen peroxide and would be dangerous outside of a controlled school setting. Dry ice dropped in warm water with a squirt of dish soap produces an interesting effect, but it’s somewhat different from the oozing pumpkin.
October 22nd, 2007 at 2:11 pm
I was planning on doing the H2O2 foaming at the mouth, Jack-O-Lantern with my classes and the Science Club…but then I heard about the exploding pumpkin. I’ve used a calcium carbide lantern before and use to blow a tennis ball about 20ft up in the air w/ a make-shift calcium carbide “cannon”.
Do you have any suggestions for amounts of carbide and water to use for a good effect?
I have a Masters of Science in Physical Chemistry but it was for computer simulations—I wasn’t in a wet lab. I teach at Palmetto Ridge High School in Naples, Fl.
Thank you,
Allison Joy Chapman
Chemistry Instructor
ChapmaAl@collier.k12.fl.us
Palmetto Ridge High School
Chemistry Room 569
1655 Victory Lane
Naples, Fl 34120
239-377-2400 x2495
October 30th, 2007 at 8:56 pm
You only need a little carbide (tsp?). The main thing is to wait about 20 seconds or so for the gas to build.
I seem to remember a Steve Spangler exploding pumpkin where he just tapped on the pumpkin. I have no idea how that one was done.
October 31st, 2007 at 10:58 pm
I am a lab manager for a chemistry class, and the superintendent of my school district and I are looking at performing the exploding pumpkin experiment for a kindergarten class during Halloween. I have looked all over for some sort of detailed instructions. However, I can’t find one that says exactly how much Calcium Carbide to use, how much water to use, or even how long you need to wait for the reaction to take place. Flinn doesn’t have a write up for it, and neither does anyone else as far as I saw. Can someone give me a little help so I don’t have to do this the “trial and error” way? That could get messy…