Date: Tue, 4 Feb 1997 03:32:41 -0500 (EST)
From: NFetter@aol.com
Message-Id: <970204000416_-1811370802@emout02.mail.aol.com>
To: pinhole@exploratorium.edu
Subject: Volcanoes
Hi Pinholers,
You can make a neat volcano by igniting ammonium dichromate
(NH4Cr2O7). The orange crystals turn into green mountain of chromium oxide.
Do this demo in a fume hood, because the oxide is toxic. The gas emmitted
during the reaction is nitrogen (harmless).
You can make a whizz-bang geyser by putting 50 ml of water and 50 ml of 30%
peroxide solution in a 2 liter plastic bottle. Add about 5 grams of manganese
dioxide and stand back! The geyser is just steam.
Good
Luck, Neil Fetter