70.2 MB (8.5 MB compressed)
8500 x 2885 pixels
71.9 x 24.4 cm ⏐ 28.3 x 9.6 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Ammonium dichromate volcano. A small mound (2.4 g) of ammonium dichromate ((NH4)2Cr2O7) is placed on a ceramic tile. A fuse (rolled paper soaked in alcohol) is placed in the mound and ignited. Ammonium dichromate decomposes, it gives off orange sparks and throws green chromium(III) oxide, producing an effect resembling a volcano. The reaction is (NH4)2Cr2O7 -> Cr2O3 + N2 + H2O. The resulting chromium(III) oxide is fluffier than the original ammonium dichromate, giving the appearance that the amount of material increases in the reaction.
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