Re: Mini-volcano
Title: Re: Mini-volcano
Try also: http://www.west.net/~science/volcano.htm
This uses ammonium dichromate.
An exciting demonstration
volcano can be made with a bit of ammonium dichromate. This is a fun
science demonstration that takes almost no time at all to prepare.
Place a small quantity (12 to 15 grams, or half an ounce) of Ammonium
Dichromate powder on a clay tile. Form the powder into a cone shape.
Dim the room lights, and light the top of the cone. The ammonium
dichromate will burn fiercely while producing large volumes of a
grayish green ash. Small orange sparks will shoot upward a couple of
inches.
This reaction can be incorporated into your papier-mache volcano model
like this:
At the top of your model, insert either a 30 ml crucible, a jar lid,
or some other flame-resistant container. Coat your volcano model with
a plaster slurry to fireproof it, especially near the top of the cone.
Place the ammonium dichromate in the fire resistant cup at the top of
the volcano, and light it.
IMPORTANT SAFETY
NOTE: There is some controversy about the hazards of this experiment.
While it has been used for many years in education, some chromium
compounds have been found to be carcinogenic. No one can eliminate the
possibility of contracting cancer. And occasional exposure to most
carcinogens has not been linked to the disease, only sustained
exposure. It is left up to the user to weigh the risk versus the
benefits of this chemical exposure. At any rate, you should take care
not to ingest the reactant or its product. Wash your hands after
performing the experiment, and use adequate ventilation.
At 11:34 AM -0700 11/8/01, Jim Green
wrote:
>Phys-lers: My children now remind me that when they were young, I
did some
>demo for them which had to do with a mini-volcano -- a small pile
of some
>stuff with some sort of something inside which reacted in
some way -- You
>can see that the procedure is crystal clear in our minds
currently. I
>doubt that it was a fiery action -- I would not have put gun
powder in a
>pile of sand for example -- Maybe a frothy substance belched
out of the
>mound.
>
>They now want to repeat this for their children -- Look what I
have wrought!
>
>Anyone have a hint about this???
<http://hometown.aol.com/ckckside/reports/volcanoes/vol1.htm>
<http://volcano.und.nodak.edu/vwdocs/volc_models/models.html>
<http://chemistry.about.com/c/ht/01/07/How_Build_Volcano0995055603.htm?iam=dpile&terms=science+fair+volcano>
Larry